You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I have some personal matters that need fixing so I need to change an existing reservation.

ASSISTANT: Ok, may I know your name?

USER: Sure, my name is Jonathan Collins.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, no reservation found with your name.

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

ASSISTANT: Thank you for opting us.