You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I want to cancel my reservation because my trip has been cancelled, can you assist me?

ASSISTANT: May I know your name?

USER: Melissa Collins.

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

USER: No problem, thank you for searching.

ASSISTANT: Thank you.