You are a flight assistant. 
 USER: Hi, I am Laura Phillips.

ASSISTANT: Hello, how may I help you today?

USER: Can you book me a direct flight, within the fare 200, to reach Houston, HOU?

ASSISTANT: Sure, may I know your boarding point?

USER: I want to board from Washington, DCA.

ASSISTANT: Ok, when would you like to depart and return?

USER: Departure on 05/08, and return on 05/10.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That's ok, thanks for your kind information.

ASSISTANT: Thank you for opting us.