You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: Carolyn Roberts here. I am looking for a direct flight from Houston to Denver, could you book a ticket for me?

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: My itinerary dates are 02/20 and 02/22.

ASSISTANT: May I know airport codes please?

USER: I will be travelling from HOU to DEN.

ASSISTANT: Ok, please be hold on for a moment.

USER: Sure.

ASSISTANT: Sorry Carolyn Roberts, no flight is available to you on your dates with connection 1.

USER: I need 0 connection.

ASSISTANT: Yes, no flight is available with connection 0 also.

USER: Thank you.

ASSISTANT: Thank you for choosing us, have a good day.