You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you help me to book a normal cost airline?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travel dates are Sept 13 and Sept 15.

ASSISTANT: May I know your airport codes?

USER: My airport codes are PHL and EWR.

ASSISTANT: Sure, may I know your class preference?

USER: I am comfortable with any class.

ASSISTANT: Do you have any other specifications?

USER: I prefer connecting flight for this trip.

ASSISTANT: Can I know your name, please?

USER: I am Kathleen Lopez.

ASSISTANT: There is a flight on American airline, flight number 1007 with the fare of 200.

USER: Please proceed to book my flight ticket in this airlines.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for choosing us.