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

ASSISTANT: Hello, how may I help you for today?

USER: I had planned to go on a trip, but it was postponed due to some reasons. Can you change my recent reservation?

ASSISTANT: Sure, I am here to help you. Please wait for a moment to check your reservation details..

USER: Ok, take your time.

ASSISTANT: Sorry to say, no resrvation found on your name.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for reaching us, have a nice day.