You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Mary Gonzalez. I want to book a flight ticket from DCA to HOU. Can you make a reservation for me?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Sure. my itinerary dates are on 08/20 and return on 08/22.

ASSISTANT: Please give me a moment.

USER: Ok, make sure that the connection limit 1.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: Ok, not a problem. Thank you for your information.

ASSISTANT: Welcome, have a great day.