You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Stephen Scott. There was a tsunami at my visiting place, so I would like to change my reservation.

ASSISTANT: Sorry Scott, there is no ticket found on your name, I think the booking is not yet done in previous state.

USER: That's ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your support.