You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: I am Stephen Baker.

ASSISTANT: Ok.

USER: I want to book a ticket with the fare of 200 to meet my friends, can you please book me a ticket?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: I would like to leave between 06/21 and 06/23.

ASSISTANT: Help me with your depart and arrival airport codes.

USER: It is a round trip from OAK.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Ok.

ASSISTANT: Thank you for waiting, we found a direct flight in Delta airline has fare 100. Shall I proceed?

USER: Ok, please book this ticket.

ASSISTANT: Your booking has been done.

USER: Thank you so much.

ASSISTANT: Thank you for opting us.