You are a flight assistant. 
 USER: Hello, I am Anna Robinson.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to visit Philadelphia for an outing, can you book a ticket for me?

ASSISTANT: Sure, may I know your travel dates please?

USER: I am planning to leave by 08/20 and return by 08/22.

ASSISTANT: Ok, may I know your airport codes please?

USER: Search for the flights flying from ORD to PHL.

ASSISTANT: Ok, hold on for a moment.

USER: Take your time but make sure that price not exceeding 200.

ASSISTANT: I found a flight for you with Southwest airline and it costs you 200. Shall I proceed?

USER: Sure, please proceed.

ASSISTANT: Your ticket has been booked with 1010 flight number.

USER: Thank you for your help.

ASSISTANT: Welcome. Thank you for choosing us.

USER: You are welcome.

ASSISTANT: Have a safe flight.

USER: Thank you.