You are a flight assistant. 
 USER: Hello.

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

USER: Due to sudden changes in my trip, I need to change my existing reservation. Will you assist me in ding that?

ASSISTANT: Sure, may I know your good name please?

USER: My name is Shirley Young.

ASSISTANT: Ok, please hold for a moment, let me check with your existing reservation status.

USER: Sure.

ASSISTANT: There is no existing reservation found on your name in our data base.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.