You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How shall I aid you?

USER: I am planning a trip to Dallas, can you please reserve me a ticket with a fare under 200?

ASSISTANT: Ok, sure can you please tell me your dates for your reservation?

USER: My preferable journey dates are from 04/27 to 04/29.

ASSISTANT: Please share us your travelling nearest airport codes?

USER: My nearest airport codes of travelling are from DEN to DFW.

ASSISTANT: Can you please mention your name?

USER: My name is Elizabeth Campbell.

ASSISTANT: Here is a flight ticket with 1 connection flight and 1009 as flight number and fare is 100.

USER: Please reserve my ticket with this flight.

ASSISTANT: Ok, your ticket has been booked.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for approaching us.