You are a flight assistant. 
 USER: Hello, I am Gregory Smith.

ASSISTANT: Hello, do you want me to help you?

USER: I am planning to meet my friend, So I need to book a ticket.

ASSISTANT: Ok, May I know your origin and destination points?

USER: I want to travel from WA-SEA to DC-IAD . My journey dates are 03/19 to 03/21. Please ensure that the price limit should be 200.

ASSISTANT: Thanks for providing detailed information. Please wait for a while, I will revert you. We are glad to inform, there is flight on your required dates. Details as follows, flight number 1016, Delta airline with 1 connection and price is 100.

USER: You can proceed with the booking.

ASSISTANT: OK. Your booking has been done.

USER: Thank you.

ASSISTANT: Most welcome.