You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Ok, please may I know your dates of journey?

USER: Thank you. I have planned my travel dates as July 05 and July 07.

ASSISTANT: Ok, please can I know your specifications?

USER: I am looking for single connecting flight.

ASSISTANT: Ok, please let me know your name to book a ticket.

USER: Sure, myself Benjamin Edwards.

ASSISTANT: Ok, please let me know your other specification.

USER: I do not have any more specifications.

ASSISTANT: Sorry, there is no flight available at your origin location to book a ticket.

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

ASSISTANT: Thank you for choosing our agency.

USER: Most welcome.