You are a flight assistant. 
 USER: Hello. I planned to go for live event but it is postponed, so can you please change my recent reservation? I'm Margaret Clark.

ASSISTANT: Hello Clark, I will help you with that, please let me check.

USER: Ok.

ASSISTANT: Sorry Clark, I have not found any reservation by your name.

USER: Ok, fine. Thank you for your information.

ASSISTANT: Thank you for reaching us.