I normally show emotion to whatever they've been saying (as in, laughing if it's funny, "oh no"-ing if it's bad) and say "Well, I better get back to work now, but thanks for the chat and have a great day/night!" Or something similar.
Chat with our AI personalities
A teller is generally someone who works at a bank. Therefore, a conversation should begin with the teller asking how he or she may help the customer. The customer would respond with their transaction, and the teller would then thank the customer and wish them a good day or weekend.
It would not be appropriate to interrupt them if they are talking and it would depend on the situation whether it would be appropriate to jump in and say anything if they have paused briefly. If their hesitation lasts long enough to feel uncomfortable, most customers would probably appreciate a brief, kind reminder of what they were saying or for the CSR to pick up the conversation.
Any call that has two-way conversation would be regarded as dialogue. Idle conversation is a type of dialogue, also known as banter, that may be considered by some as meaningless small talk. I would argue, however, that -- especially in business situations with a stranger -- small talk is exceedingly valuable for better understanding, building rapport and, ultimately, trust.
One would contact o2 customer services if he or she had questions about their account. Another reason would be for technical issues. Finally, customer service would be contacted to make a purchase.
You tell the customer nicely to please stop yelling and use an indoor voice.