You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Benjamin Mitchell here.

ASSISTANT: Is there any help that you are requesting from my side?

USER: My planned trip has cancelled as of now, can you please help me in cancelling my reservation?

ASSISTANT: Yes, Please wait for a moment to check your previous ticket booking in our data base.

USER: Sure, take your time.

ASSISTANT: When I checked in our data base, I am unable to find your ticket booking to cancel it.

USER: That's ok, may be I did a wrong booking. Thank you anyways.

ASSISTANT: You are most welcome.