You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I want to change my existing reservation, due to some health issue. Can you help me?

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

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Yes, I am Laura Evans.

ASSISTANT: Sorry, there are no reservations found.

USER: That's fine, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.