You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am planning to travel from HOU to IAD, help me in booking a flight?

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

USER: My travelling dates are Dec 17 to 19.

ASSISTANT: Ok, please may I know your name?

USER: I am Anthony Walker.

ASSISTANT: Ok, please provide me your specifications.

USER: I want to return back on afternoon flight.

ASSISTANT: Yes, can I know your other specifications?

USER: No.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing our agency.