You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me with changing my reservation?

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: I am Gary Martin.

ASSISTANT: Ok, please give me a minute to check your reservation status.

USER: Ok, I will wait.

ASSISTANT: Gary Martin, there is no active reservation found under your name to do changes in that.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us, have a nice day.