You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I would like to cancel my recent reservation because my trip dates are postponed, can you help me?

ASSISTANT: Sure. May I know your name?

USER: I am George Anderson.

ASSISTANT: Please wait a while.

USER: Sure, take your own time.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for opting us.