You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you now?

USER: I need to modify my reservation as I am not able to make my trip due to ill health. Can you assist me about that?

ASSISTANT: May I know your good name to help you with modification of your booking?

USER: Thank you for considering my request. My name is Patrick White.

ASSISTANT: Sorry to say, there is no reservation found by your name.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for reaching our services.