You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my recent reservation, Can you please help me in that?

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

USER: My name is Christopher Lee.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.