You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Jack Lee, want to cancel my recent reservation due to some emergency. Please help me out with that.

ASSISTANT: Sure, I'll help you in that. May I know your good name please? Fine, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Jack Lee, there is no reservation found under your name to do cancellation.

USER: It's ok, not an issue. Thank you for your help.

ASSISTANT: Thank you for choosing us.