You are a flight assistant. 
 USER: Hello, I am Patrick Green.

ASSISTANT: Hello, how may I assist you?

USER: Due to an emergency meeting, I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, I am here to help you. Please wait a moment, I will check your reservation status.

USER: Ok.

ASSISTANT: Patrick Green, no reservation has been found on your name in our records.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.