You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Patrick Turner here.

ASSISTANT: How can I aid you in booking flight ticket?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

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

USER: Thank you.

ASSISTANT: Please wait a moment, I will check you reservation status.

USER: Ok, I will wait.

ASSISTANT: There is no previous reservation found in your name Patrick Turner.

USER: Anyway, thanks for the information.

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