You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: My meeting got postponed as of now, so I need to change my existing reservation.

ASSISTANT: Ok, may I know your name please?

USER: Timothy Wright here.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say, there is no reservation found with your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.