You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Gary Thompson want to change my reservation owing an emergency at home.

ASSISTANT: Sure, we are grateful to help you. Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for your time, we are sorry to inform you that no reservation has found based on your specified name.

USER: Thank you for your help.

ASSISTANT: Thanks for connecting with us, have a pleasant day.