You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: I am Ryan White. Can you please help me in changing my recent reservation?

ASSISTANT: Sure, I will help you in changing the ticket.

USER: Ok.

ASSISTANT: Sorry, there are no reservations found in our database.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for choosing us.