You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Edward Jones. I need to change my existing reservation due to postpone of my trip with my friends. Could you please help me?

ASSISTANT: Sure, please wait.

USER: Sure.

ASSISTANT: Sorry there is no reservation on your name. Thank you.

USER: No problem, thank you for the information.