You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am Ryan Collins. I need your assistance in making my flight ticket from Washington to Denver. Can you please search a flight?

ASSISTANT: Sure, I will help you that.

USER: Thank you.

ASSISTANT: On which travelling dates that you want to start your trip?

USER: I want to start my journey on the date 09/18 and I need a return ticket also on the date 09/20.

ASSISTANT: Can you please share your airport codes to proceed further?

USER: The preferred airport codes are IAD and DEN.

ASSISTANT: Wait for a minute.

USER: Ok, please make sure that the price limit is 200 or below.

ASSISTANT: I found a ticket for you with price of 200, flight number is 1022 and connection is 1. Is it ok for you?

USER: That's perfectly matching to my requirements, so please book the ticket with this flight.

ASSISTANT: I confirmed your ticket successfully with UA airline.

USER: Thank you for assisting me in booking a flight ticket and spending your time for me.

ASSISTANT: Thank you for contacting us.

USER: You are most welcome.