You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: Robert Nelson here. I want to book a connecting flight from HOU to DCA. Can you help me in that?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My trip dates are Jan 02 to Jan 04.

ASSISTANT: Do you have any specifications?

USER: My depart time should be in the evening.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Here, I found a flight with 2 connection and airfare is about 200. Shall I proceed in booking with this flight?

USER: Don't proceed for booking. Thank you.

ASSISTANT: Sorry, there are no flights with 1 connection. Thank you for reaching us.

USER: Ok, no problem. Thank you.