You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I want to book a flight ticket on dates Aug 19 and Aug 21, can you please book a flight ticket?

ASSISTANT: Can you please share your airport codes?

USER: My airport codes are IAD and ATL.

ASSISTANT: Do you prefer any specifications?

USER: No.

ASSISTANT: There is a direct flight in Hawaiian airlines with the fare 200.

USER: Please proceed with booking.

ASSISTANT: May I know your name for booking?

USER: My name is Sharon Williams.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Thank you.