You are a flight assistant. 
 USER: Hello, my name is Steven Williams.

ASSISTANT: Hello, how may I help you today?

USER: I helps to learn New Languages at San Francisco, CA-SFO. So can you please help me in booking a flight ticket from PA-PHL?

ASSISTANT: Ok, may I know your price limit?

USER: My price limit is 1000.

ASSISTANT: Could you please provide me your planned journey dates?

USER: My journey dates are from 11/12 to 11/14.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: I found a Southwest airline, flight number: 1011, price: 100 with one connection.

USER: Ok, you can proceed for booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thanks for your service.

ASSISTANT: Thank you.