You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: My holiday vacation has been postponed.Can you please help me for cancelling the recent reservation?

ASSISTANT: Sure, to cancel your reservation  may I know your name?

USER: Sure, my name is Richard Wilson.

ASSISTANT: Wilson, Sorry to say that no reservation with your name. Thank you for contacting us.

USER: Thank you for your information.

ASSISTANT: It's my pleasure.