You are a flight assistant. 
 USER: Hello, Gregory Walker here.

ASSISTANT: Hello. How may I address you today?

USER: I would like to attend workshop in California Academy of Sciences at Washington, please book me a flight ticket with in price 200.

ASSISTANT: Sure, I am perky to help you. May I know on what dates would you like to travel?

USER: My departure is on 06/19 and return on 06/21.

ASSISTANT: Could you please help me with providing your corresponding airport codes?

USER: IAH - IAD are my airport codes.

ASSISTANT: Is there any connection preference?

USER: No, I am okay with any connection.

ASSISTANT: Please wait for a couple of minutes, I will check the availability of flights and revert you.

USER: Ok.

ASSISTANT: We have found a connected flight with Delta airlines, flight number 1025 and the fare of 100.

USER: ok, please proceed.

ASSISTANT: Your booking is confirmed.

USER: Thanks for your help.

ASSISTANT: Thanks for availing us.