You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I want to reserve my ticket from DCA to DFW, can you please help me in booking?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Ok, my planned dates of journey are from Jun, 01 to Jun, 03.

ASSISTANT: Do you have any preferences about class?

USER: Yes, I want a single connecting flight.

ASSISTANT: Do you have any preferences about airline?

USER: No class preference or airline preference are needed.

ASSISTANT: Please mention your name.

USER: Sure, my name is Edward Lewis.

ASSISTANT: The American airlines providing an economy class flight with price 100 and the connections 1. Shall I confirm your ticket?

USER: Ok, you can book it.

ASSISTANT: Your ticket is booked. The flight number is 1021.

USER: Thank you for your service in booking my ticket.

ASSISTANT: Welcome, have a great day.