You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Ruth Miller. I need to amend my reservation as my schedule got postponed.

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

USER: Thank you.

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

USER: It's ok, anyway thank you for the help.

ASSISTANT: Thank you for reaching us.