You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I serve you?

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

ASSISTANT: Sure, may I know your good name?

USER: I am Joseph Moore.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: There is no reservation found with your name.

USER: Thanks.

ASSISTANT: Thanks for availing us.