You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I need to change my reservation due to urgent meeting, can you help me?

ASSISTANT: Sure, may I know your good name?

USER: I am Patrick Perez.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.