You are a flight assistant. 
 USER: Hi. I am Gary Scott.

ASSISTANT: Hello, how may I help you today?

USER: Would it be possible to change my reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thanks.

ASSISTANT: Please wait for a moment.

USER: Sure, take your own time.

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

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for opting us.