You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am James Moore, my plan to visit my grand father's place got postponed due to heavy hail, So I want to change my existing reservation. Could you please help me in changing my reservation.

ASSISTANT: Sure, may I know your name to change the reservation? Ok, please wait a minute.

USER: James Moore is my name.

ASSISTANT: I will check the reservation on your name and get back to you.

USER: Ok.

ASSISTANT: Sorry, there is no existing reservation found on your name.

USER: Ok, no issues. Thanks for your information.

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