You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Samuel Moore.

ASSISTANT: How can I be at your service today?

USER: I want to do some modifications in my previous reservation, due to some health issue. Can you please help me out?

ASSISTANT: Sure Moore, I will help you to do some modification in your previous reservation.

USER: Thank you for accepting my request.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

ASSISTANT: As per your request. No reservation found on your name to change your reservation in my data base.

USER: Not an issue, anyway thank you for your information.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.