You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I am planning to visit the reading terminal market which is located in Philadelphia, PHL. Can you help me to book a flight ticket?

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

USER: My source is from Houston, HOU.

ASSISTANT: Can I know your travelling dates?

USER: My travel dates are Sept 22 and 24.

ASSISTANT: Do you need any specifications?

USER: I need a connecting flight.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: There is a flight with one connection and the price is 200 in Delta Airlines, can I proceed with the reservation?

USER: Please proceed.

ASSISTANT: May I know your name?

USER: Timothy Thompson.

ASSISTANT: Your ticket has been reserved with the flight number 1014 in economy class.

USER: Thank you for helping me.

ASSISTANT: Thank you for reaching our service.