You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I will help you in changing the reservation. May I know your name please?

USER: My previous reservation has done with the name Kevin Lopez.

ASSISTANT: Sorry, there are no reservations found.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for providing information.