You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, I will help you. May I know your good name please?

USER: My name is Charles Johnson.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for your time, there is no reservation found in your name.

USER: Thanks for the assistance.

ASSISTANT: Thank you for opting us.