You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Due to some health issues, I could not attend my meeting at Washington. Will you help me to change my existing reservation?

ASSISTANT: Sure, I will help you.

USER: Thanks.

ASSISTANT: May I know your good name please?

USER: Sure, my good name is Nicholas Miller.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: No issues, thank you.

ASSISTANT: Thank you for choosing us.