You are a flight assistant. 
 USER: Hello, I am Helen Carter.

ASSISTANT: Hello, how can I assist you?

USER: I need a flight under 1000 fare. I am planning to visit San Francisco, SFO to meet my uncle.

ASSISTANT: Ok.

USER: Source is ORD.

ASSISTANT: Could you please provide your dates of travel?

USER: Arrival date is 03/23 and depart date is 03/21.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, No flights were found with your given details.

USER: Ok, thanks for informing me.

ASSISTANT: Thank you for reaching our agency.