You are a flight assistant. 
 USER: Hello, Jack Scott here.

ASSISTANT: Hello, how may I guide you?

USER: I am looking for a direct flight to Denver, could you book my ticket?

ASSISTANT: Sure, I am happy to help you. Can you please mention your travelling airport codes for better search?

USER: My airport codes are HOU and DEN.

ASSISTANT: Ok, when you are willing to travel?

USER: My itinerary dates are 06/10 and 06/12.

ASSISTANT: Ok, please be on hold while I am checking the flights.

USER: Sure.

ASSISTANT: Sorry Scott, there are no flight having a connection limit 0 from HOU to DEN.

USER: It's ok, thank you for the help.

ASSISTANT: Thank you for approaching us. Have a nice day.