You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Mary Walker. I want to book a ticket from Philadelphia, PA - PHL to San Francisco, CA - SFO. Can you book a ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: I want to travel on 03/10 and return on 03/12.

ASSISTANT: How much you can afford for this ticket?

USER: I can afford up to 500.

ASSISTANT: We found a flight on your details with airline AA, flight number: 1023. Shall I book this ticket?

USER: Please, book a ticket.

ASSISTANT: Your ticket has been booked.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you.