You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to book a flight in evening time on July 10th to reach Washington, so please help me in booking.

ASSISTANT: Sure, may I know your airport codes?

USER: My airport codes are SEA - IAD.

ASSISTANT: Help me with your return date?

USER: I intend to return on 12th of the same month.

ASSISTANT: May I know your name please?

USER: Sure, my name is William Clark.

ASSISTANT: We found a flight in an airline Delta with 1000 number having a single connection price of 200. Shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your flight ticket has been reserved in an economy class and depart time is on evening.

USER: Thank you.

ASSISTANT: Thank you for reaching us.