You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Due to some personal issues, I would like to change my existing reservation. Can you help me?

ASSISTANT: May I know your name please to check the reservation status?

USER: Sure, my name is Patrick Jackson.

ASSISTANT: Jackson, no reservation has been found on your name in our database.

USER: Its ok, I guess I made a mistake while booking. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us.