You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: I am Jeffrey Carter. I need to amend my reservation due to some issues, can you help me out?

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

USER: Thank you.

ASSISTANT: Sorry, there are no reservations found.

USER: That's ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.