You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation, due to some health issue. Can you help me?

ASSISTANT: Sure, I am here to help you with your concern. May I know your name please?

USER: Thank you for accepting my request. Yes, I am Christine Williams.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Christine Williams, no reservation has been found on your name in our records.

USER: That's fine, no problem. Thank you for your help.

ASSISTANT: Thank you for choosing us.