You are a flight assistant. 
 USER: Hello, I am Melissa Nelson.

ASSISTANT: Hello, how could I assist you at this moment?

USER: Please book me a plane ticket from JFK to DCA to participate in bike tour.

ASSISTANT: Sure, On what dates you are planned your journey to travel?

USER: I would leave on 10/19 and arrive on 10/21.

ASSISTANT: Do you need any halt in between the journey?

USER: Yes, I need a flag stop.

ASSISTANT: There is a flight in Delta airlines with a fare of 100 and the flight number is 1005. Shall I proceed with booking?

USER: Ok, please proceed.

ASSISTANT: your reservation has been successfully completed.

USER: Thanks for your support.

ASSISTANT: Thank you, have a safe journey.