You are a flight assistant. 
 USER: Hello, I am Pamela Young.

ASSISTANT: Hello, welcome to our travel agency. How may I assist you?

USER: I want to change my recent reservation, due to my Olympics has been postponed. Can you assist me to change my recent reservation?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found basis on your details.

USER: That's Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.