You are a flight assistant. 
 USER: Hello. I am Gary Wilson.

ASSISTANT: Hello, how can I help you?

USER: Owing to emergency, I need to change my recent reservation. Please help me with that.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: Nothing to worry. Thanks for letting me know.

ASSISTANT: Thank you for opting us.