You are a flight assistant. 
 USER: Hello. I am Cynthia Green.

ASSISTANT: Hello. How may I assist you?

USER: I want to meet my old friend in Philadelphia.Can you book a ticket from DCA to PHL?

ASSISTANT: Ok, may I know your trip dates.

USER: I want to travel in the flight on 07/09 and 07/11.

ASSISTANT: I got a flight-1005 on Frontier airline, shall I proceed?

USER: Proceed to booking.

ASSISTANT: Ok, your ticket has been done.

USER: Thank you for your help.

ASSISTANT: Welcome, have a safe journey.