You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I'm Larry Baker. I want to visit my friend's home in Dallas.Can you book a ticket from DC - DCA to TX - DFW?

ASSISTANT: Can you please provide me your travelling dates?

USER: I want to depart on 01/21 and return by 01/23. The connection limit is 0.

ASSISTANT: Sorry, there is no flight available with 0 connection.

USER: That's Ok. Anyways thank you for your help.

ASSISTANT: Thank you for reaching us.