You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I assist you?

USER: Please book a ticket from Oakland, CA-OAK to Washington DC-DCA.

ASSISTANT: Ok, may I know your travel dates?

USER: My travelling dates are from 11/11 to 11/13.

ASSISTANT: Do you have any preference?

USER: Price limit 200. Connections limit 1.

ASSISTANT: Sorry, only direct flights are available on your travel dates. Shall  I proceed?

USER: My name is Mary Jackson. Thank you.

ASSISTANT: Thank you for opting us.