You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Carol Evans on this end.

ASSISTANT: How can I help you now?

USER: I would like you to help me with cancellation of my reservation, hope you can help me with it.

ASSISTANT: Sure, I will help you with that.

USER: Thank you so much.

ASSISTANT: Sorry Carol, there is no reservation found on your name.

USER: Oh! That's sad news for me. Anyways, thank you for checking with my previous booking.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: You are most welcome.

ASSISTANT: You are welcome.