You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning! How can I assist you?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, I'm happy to help you with that. Can I know your good name please?

USER: I am Michael Walker.

ASSISTANT: Ok, please wait while I'll check your reservation status.

USER: Sure.

ASSISTANT: Michael Walker, there is no active reservation found under your name to do modifications in that.

USER: No problem, thank you for checking.

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