You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Can you please book me a flight ticket from HOU to BOS?

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

USER: My travel dates are from May 2nd to May 4th.

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

USER: I would prefer a connecting flight.

ASSISTANT: Do you have any particular time for departing and returning?

USER: No.

ASSISTANT: May I know your good name please? Sorry, there is no flight available on your requested dates.

USER: I am Barbara Williams. No problem, thank you.

ASSISTANT: Thank you for approaching us.