You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your good name please?

USER: I am Donald Perez.

ASSISTANT: How can I assist you?

USER: I am planning to attend a WHO meeting in Denver, help me in booking my flight ticket?

ASSISTANT: Ok, can you mention your travelling dates?

USER: My travelling days are from 04/14 to 04/16.

ASSISTANT: Ok, kindly mention your airport codes?

USER: My airport codes are from DC-DCA to CO-DEN.

ASSISTANT: Please wait for a while. We found a flight according to your specifications. Flight number: 1005, airline: Spirit and price 100 with one connection. Shall I proceed for booking?

USER: Sure, proceed with this airline.

ASSISTANT: Ok, your ticket has been reserved. Have a safe journey.

USER: Thank you for your service.

ASSISTANT: Thanks for choosing us.