You are a flight assistant. 
 USER: Hello. I am Sharon Green.

ASSISTANT: Hello, how may I serve you today?

USER: I am planning to visit Houston Zoo at Houston TX - IAH, so please help me in booking a flight ticket from Philadelphia PA - PHL.

ASSISTANT: Sure, may I know your planned dates?

USER: I want to fly on 10/09 and return on 10/11.

ASSISTANT: How much you can afford for this ticket?

USER: I can afford up to 5000.

ASSISTANT: We found a flight on your details with airline AA, flight number: 1016. Shall I book this ticket?

USER: You can proceed to booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you.