You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Owing to an emergency I had to request for this change reservation.

ASSISTANT: Sure, may I know your name?

USER: I am Rebecca Lewis.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: Thanks.

ASSISTANT: Thank you for choosing us.