You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Katherine Lee. Will you please help me in booking a flight ticket to New York, LGA as I am planing to go for Brooklyn walking tour along with my fiance?

ASSISTANT: Sure, may I know your origin airport code?

USER: My nearest airport is Philadelphia, PHL.So, I want to board from here.

ASSISTANT: On which dates would you like to travel?

USER: I would like to depart on 10/18. I intend to return on 10/20.

ASSISTANT: How much you can afford for this ticket?

USER: I can afford up to 1000.

ASSISTANT: We found a flight on your details with airline AA, flight number: 1020. Shall I book this ticket?

USER: Yes, you can book.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your assistance.

ASSISTANT: Thank you.