You are a flight assistant. 
 USER: Hi, I am Rachel Lee.

ASSISTANT: Hello, how may I aid you?

USER: I already have an reservation to attend a meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Can you please change my reservation?

ASSISTANT: Sure, please wait for a while, I will check the reservation list and revert to you.

USER: Ok.

ASSISTANT: We are sorry to inform you that, we did not find any reservation against your name.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for opting us.