You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you?

USER: I am Gary Mitchell. I have an earlier reservation to sign a new contract for new project, due to some problems it got postponed, so I want to change my reservation. Can you please help me?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: No reservation found on your time.

USER: Ok, no problem. Thank you.

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