You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Nicholas Martinez. Could you please help me to change my existing reservation?

ASSISTANT: Sure Nicholas, hold on for a moment. I'm sorry, there are no reservations on your name.

USER: That's ok.

ASSISTANT: Thank you, have a good day.

USER: Thank you for the information.