You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need some help in my changing due to placing of wrong while I am booking the ticket, can you help in changing my recent booking?

ASSISTANT: Sure, may I know your name please to check the reservation status?

USER: Sure, I have done the reservation on my name Justin Nelson.

ASSISTANT: Sorry Justin, there is no reservation found with your details.

USER: Ok, no problem, thank you for your quick response.

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