You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, can I know your name?

USER: I am John Thompson.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Sorry,  there is no reservation found on given name.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for reaching us.