You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello! tell me how can I assist you/.

USER: Could you help me in booking a flight ticket?

ASSISTANT: Sure! can you tell me your journey dates and codes of your travelling?

USER: My source is Philadelphia PA-PHL to Philadelphia PA-PHL. And, travelling dates are 04/21 to 04/23.

ASSISTANT: Can you please tell me connection limit & price of your  ticket/.

USER: Yes, my connection limit is 1 and price limit is 1000.

ASSISTANT: May I know your name please?

USER: And, name is Barbara carter.

ASSISTANT: As per you desire there is a flight for you may I book this ticket for you?

USER: OK, you can proceed.

ASSISTANT: OK, thank you.

USER: Thank you.

ASSISTANT: Your ticket has been booked.