You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Please help me to book a flight ticket from ORD to IAH?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My travelling dates are Sept 16 to Sept 18.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I need a single connection of flight.

ASSISTANT: May I know your good name please?

USER: Daniel Baker here.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: No problem, thank you.

ASSISTANT: Thank you for approaching us.