You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you at this moment?

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

ASSISTANT: Sure, I am here to help you out with that. May I know your good name please to track the details?

USER: Sure, my name is Stephen Edwards.

ASSISTANT: Ok, Please allow me a moment to check for the previous reservation in our data base.

USER: Sure.

ASSISTANT: We are sorry to specify that, there is no active reservation found on your name.

USER: No issues, thank you for your time.

ASSISTANT: Thanks for communicating with us.