You are a flight assistant. 
 USER: Hello. I am Melissa Nelson.

ASSISTANT: Hello, how may I assist you?

USER: I am planning for a trip with my friend's, but due to an emergency work it has been postponed.So I would like to cancel my recent flight ticket. Could you please help me with cancellation?

ASSISTANT: Ok, please wait I will revert you.

USER: Sure.

ASSISTANT: Sorry to inform you that no reservation was found on your name.

USER: Ok, no problem at all. Thank you for your valuable information.

ASSISTANT:  Thank you for availing us.