You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Gary White here.

ASSISTANT: How may I assist you?

USER: I want to amend my existing reservation as I am sick, could you help me out?

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

USER: Sure.

ASSISTANT: Gary White, no reservation has been found on your name in our records.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.