You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Due to some issues I have to change my previous flight ticket booking, can you please help me with changing?

ASSISTANT: Sure, may I know your name for checking with the details.

USER: Thank you for considering my request and I am Anthony Brown and you can check with this name.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no active reservations on your given name to change.

USER: Not a problem with that one, I think it is not booked properly. Thank you for your search and providing the information.

ASSISTANT: Thank you for reaching our service.