You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am looking to make a flight ticket from Dallas & Fort Worth, so can you find a flight with connection limit 0?

ASSISTANT: Sure, may I know your airport codes?

USER: My preferred airport codes are DFW and DEN.

ASSISTANT: Yes, can I have your travelling dates?

USER: My travelling dates are 12/04 and 12/06.

ASSISTANT: Ok, could you provide your name?

USER: Yes, I am Joseph Johnson.

ASSISTANT: Sorry Joseph, no flight's found on your connections.

USER: It's ok, thank you for searching.

ASSISTANT: Thank you for contacting  us.