You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I would like to change my existing reservation, please help me out.

ASSISTANT: Sure, may I know your name to check the status?

USER: My name is Jason Wright.

ASSISTANT: Jason, there is no reservation found with your details.

USER: Its ok, no issues. Thank you for the information.

ASSISTANT: Thank you for choosing us, have a good day.