You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Michael Collins here. I want to book a ticket from DCA to DCA.

ASSISTANT: Can I know your travel dates?

USER: My preferable dates are from 01/15 to 01/17.

ASSISTANT: Give me a minute, let me check the details.

USER: Ok.

ASSISTANT: The flight 1004 of Frontier airlines is available on your requested dates. Shall I book the ticket?

USER: Yes proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you for your help.

ASSISTANT: Welcome.