You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide assistance to you?

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

ASSISTANT: Sure, may I know on which name the ticket has been reserved?

USER: I am Anna Rodriguez.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

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

ASSISTANT: Thank you for choosing us.