You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Carol Young. I have to attend a meeting in White house it is in Washington, can you please book a flight ticket  from  IAD to DFW?

ASSISTANT: Sure, can I know your travelling dates?

USER: My travelling dates are 01/19 and 01/21.

ASSISTANT: Ok, give me a moment.

USER: I want 0 connection limit flight ticket.

ASSISTANT: Sorry to say that there are no flights found with connection 0. Sorry for the inconvenience.

USER: It's ok. Thank you for your information.

ASSISTANT: You are welcome.