You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Brian Collins, I want to change my reservation because my schedule got  postponed to some other day. Thank you for the help.

ASSISTANT: Hold on for a second.

USER: Ok, sure.

ASSISTANT: Sorry, there are no reservations found.

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

ASSISTANT: Thank you for reaching us.