You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you?

USER: Betty Lewis here. I have work in my home town, so can you help me cancelling my ticket?

ASSISTANT: Yes, I'm here to help you.

USER: Thank you.

ASSISTANT: Please give me a minute and I will get back to you.

USER: Ok.

ASSISTANT: Sorry, there is no reservation done previously to cancel.

USER: Ok, that's fine. Thank you for your services.

ASSISTANT: Is any other information you would like to know from my side?

USER: No thanks.

ASSISTANT: Thank you for choosing us.