You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Last week I booked a flight ticket but now I want to make some changes to it. So could you help me in changing the flight ticket reservation?

ASSISTANT: Sure, we are pleased to serve you.

USER: Ok.

ASSISTANT: On whose name, the reservation has been made earlier?

USER: Jason Hall.

ASSISTANT: Please wait for a while, I will check the reservation list and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, but there is no active reservation found in your name to change.

USER: Not a problem. Thanks for your help.

ASSISTANT: Thank you for opting us, we will try to serve you for the next time.