You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am William Hall.

ASSISTANT: How can I assist you?

USER: I want to travel from DCA to DEN. Can you book a flight ticket for me?

ASSISTANT: Ok, may I know your travelling dates?

USER: I want to travel on 11/03 and 11/05.

ASSISTANT: Here is a flight ticket with fare 200 and 1017 as flight number. Shall I proceed?

USER: Proceed to booking.

ASSISTANT: Ok, your ticket is confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.