You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what type of help you are looking form our service?

USER: Joshua Allen here. Can you help me to book a flight ticket to DCA from IAD?

ASSISTANT: Sure, I will help you with that Allen. Can you please let me know your planned dates of your journey?

USER: Ok, my preferable journey dates are from 02/20 to 02/22.

ASSISTANT: Please wait for sometime, while I will check the available flight for your journey.

USER: Sure, take your time.

ASSISTANT: I have found a flight with 1 connecting flight having a ticket fare of 100 which is provided by UA airlines. Shall I proceed with the booking?

USER: Ok, please proceed for booking.

ASSISTANT: I have booked your flight ticket successfully in the flight 1007 in an economy class.

USER: Thank you for your service.

ASSISTANT: You are most welcome, thank you for employing our service. Have a safe journey.