You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Myself Gregory Martinez. I need to change my reservation due to my planned event got postponed. So please help me with changing my reservation.

ASSISTANT: Sure, please wait a moment I will check your reservation details and proceed further.

USER: Sure, take your time.

ASSISTANT: Ok. Sorry to say, there is no reservation on your name in my database.

USER: It's ok, no problem. Anyway, thank you for your time.

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