You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Patricia Walker. I want to change my reservation which I have done my booking last month for my journey.

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

USER: Thank you for considering my request.

ASSISTANT: Ok, please wait for a while.

USER: Ok, sure.

ASSISTANT: Sorry, there are no reservations found.

USER: It's ok, anyway thank you for the help.

ASSISTANT: Thank you for reaching.