You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: Myself Patricia Mitchell. I need to change my flight ticket booking.

ASSISTANT: Sure, I will help you with that. Please, wait for a while.

USER: Thank you. I will wait for your reply.

ASSISTANT: Sorry, we have not found any reservation on your name in our database.

USER: Not a problem. Thank you.

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