You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dorothy Jones.

ASSISTANT: How may I serve you today?

USER: I would like to change my reservation as I got sick, can you please help me out?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no reservation on your name in our records.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for contacting us, have a great day.