You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, we are here to help you. May I know your name to check your details in our database?

USER: I am Timothy Collins.

ASSISTANT: Ok, please wait a moment. I will check and get back to you with the status.

USER: Sure.

ASSISTANT: Thank you for waiting, unfortunately there is no reservation exist on your name to proceed further.

USER: Ok.

ASSISTANT: Thank you for consulting us.

USER: Thanks.