You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I want to change my existing reservation, which is done recently. Can you please help me out?

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

USER: Sure, myself Rachel Smith.

ASSISTANT: Sorry, there are no reservations found.

USER: Not an issue with this one, anyway thank you for the information.

ASSISTANT: Thank you for reaching us.