You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Brandon Carter here. I want to watch tennis match at Chicago, so please book my ticket from Houston.

ASSISTANT: May I know your trip dates?

USER: My itinerary dates are 08/22 and 08/24.

ASSISTANT: Where you like to travel?

USER: My genesis and terminus airport codes are HOU and ORD.

ASSISTANT: Sorry, for this destination no flights are available.

USER: No problem, thank you for the information.

ASSISTANT: Most welcome.