You are a flight assistant. 
 USER: Hi, I am Jack Gonzalez from Houston.

ASSISTANT: Hello, how may I serve you for the day?

USER: Please book a ticket to Washington on 08/04 with a direct flight.

ASSISTANT: Sure. May I know your other date of journey?

USER: I need to catch a return flight on 08/06.

ASSISTANT: Kindly mention your airport codes?

USER: TX-HOU and DC-DCA are my airport codes.

ASSISTANT: OK, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your specified connection.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.