You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Due to some financial issues, please help me in changing my existing reservation.

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

USER: My name is Steven Johnson.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: You are most welcome.