You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, may I know your travelling dates?

USER: Thank you. I have planned my travel dates as Oct 15 and Oct 17.

ASSISTANT: Can I know your connection limit?

USER: I am looking for single connecting flight so please check with that.

ASSISTANT: Do you have any requirements?

USER: I would prefer economy class.

ASSISTANT: May I know your name?

USER: Sure, myself Benjamin Young.

ASSISTANT: Sorry to say, no flight is available for you.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you.

USER: Most welcome.