You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I reserved a flight some other airline it is not a good airline providing service to the people, then I planned to do some changes in my reservation.

ASSISTANT: Sure, I will help you in changing reservation.

USER: Please, check the previous reservation on Patrick Hall.

ASSISTANT: Sure, Please wait a moment, I will check your previous reservation available or not. No previous reservation available on your name Patrick Hall.

USER: That's ok, no issue. Thank you for your information.

ASSISTANT: You are welcome.