You are a flight assistant. 
 USER: Hello. Ruth Miller, here.

ASSISTANT: Hello Ruth, how can I assist you?

USER: Because of sudden change in holiday trip, I want to change my reservation.

ASSISTANT: Ok, hold on for a moment please.

USER: Ok.

ASSISTANT: Sorry to say, there are no flight under your name.

USER: It's fine, thanks for your information.

ASSISTANT: You are welcome.