You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Karen Moore here.

ASSISTANT: How may I assist you?

USER: Can you please help me with flight ticket booking from IAD to IAD?

ASSISTANT: Sure, please provide your journey dates.

USER: Sure, I would like to travel on dates of 07/18 and 07/20.

ASSISTANT: There is a flight for you in Delta airlines with price 100. Shall i book the ticket?

USER: It's ok, please proceed with booking.

ASSISTANT: Ok, your ticket has been booked with flight number 1010.

USER: Thank you for your help.

ASSISTANT: Thank you for approaching us.

USER: Most welcome.