You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: My name is Jason Allen. I would like to visit Washington, can you help me for booking a flight ticket from HOU to DCA?

ASSISTANT: Sure, can you share your journey dates?

USER: My travelling dates are Aug 30 and Sp 01.

ASSISTANT: Do you have any preferences?

USER: My return time is afternoon.

ASSISTANT: Do you have any specifications?

USER: I need a single connecting flight.

ASSISTANT: Give me a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.