You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I need to book a ticket from MCO to OAK. Could you book a ticket?

ASSISTANT: Sure, please share your journey dates?

USER: Departure is May, 21 and return date is May, 23.

ASSISTANT: Do you have any specifications?

USER: I would like to depart in the afternoon.

ASSISTANT: Is there any class preferences?

USER: I am comfortable with any class preference.

ASSISTANT: We found a direct flight in 1004 Frontier airlines, price is 100 economy class. Shall I proceed?

USER: Proceed for booking.

ASSISTANT: May I know your good name?

USER: I am Mary King.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for choosing us.