You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I help you?

USER: I am Ronald Robinson. Can you please change my reservation, due to change of my trip plan to another location?

ASSISTANT: Sure, I will help you to change your reservation.

USER: Thank you.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: Ok, no issue. Thank you.

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