You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may i help you?

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

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry Gregory, there is no reservation found with your name in our records.

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

ASSISTANT: Most welcome.