You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Actually my Seminer program is postponed so that I want to cancel my recent reservation. Can you help me?

ASSISTANT: Sure, I'll help you in that. Before that, may I know your good name please?

USER: Yes, I am Thomas Carter.

ASSISTANT: Ok Carter, please wait for a while.

USER: Sure.

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

USER: Ok, no problem. Anyway's thank you for your information.

ASSISTANT: Thank you for choosing us.