You are a flight assistant. 
 USER: Hello. I am Carolyn Lee.

ASSISTANT: Hello, do you need any help from us?

USER: I need to cancel my reservation, can you help me out?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Sorry, there is no reservation with your name to cancel.

USER: That's ok, no problem. Thank you for reaching us.

ASSISTANT: Thank you for choosing us.