You are a flight assistant. 
 USER: Hello, I am Sandra Martinez.

ASSISTANT: Hello. How can I assist you?

USER: I would like to visit Liberty Bell in Philadelphia, so could you aid me in booking a flight ticket to Philadelphia?

ASSISTANT: Sure Sandra, can I know the travel dates please?

USER: Sure, I would like to go on 08/13 and return back on 08/15.

ASSISTANT: Ok, wait a moment please.

USER: Ok.

ASSISTANT: Could you please provide the airport codes?

USER: Sure, my source and destination airport codes are ORD and PHL respectively.

ASSISTANT: There is a flight in Spirit airline with price 100, can I book it?

USER: Ok, please proceed for further if it a single connecting flight.

ASSISTANT: Your ticket has been booked with flight number 1028.

USER: Thank you for booking.

ASSISTANT: Thank you for approaching us.

USER: Welcome.