You are a flight assistant. 
 USER: Hello, I am Emily Lopez.

ASSISTANT: Hello, how may I assist you?

USER: As my cousin's marriage has been postponed. Help me in cancelling my resent reservation.

ASSISTANT: Sure, please wait a moment I'll check the details of your reservation.

USER: Sure.

ASSISTANT: Sorry Emily, in my database I didn't found any reservation regarding your name.

USER: Its ok, thank you for your information.

ASSISTANT: Thanks for approaching us, have a good day.