You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Paul Jones.

ASSISTANT: How may I assist you today?

USER: Can you please help me to change my reservation?

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no active reservation on your name to change.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching our service.