You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I help you?

USER: Please book a ticket from Houston, TX-HOU to Chicago, IL-ORD.

ASSISTANT: Sure, let me know when you want to travel?

USER: Travelling dates are from 05/04 to 05/06.

ASSISTANT: Do you need any connection limit?

USER: I need a direct flight.

ASSISTANT: Sorry for the inconvenience, there are no flights found on given details.

USER: Thanks for the help.

ASSISTANT: Thank you for connecting us.