You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, welcome to flight booking agency. How can I assist you today?

USER:  I would like to spend some more days with my family, so please help me in changing my existing reservation.

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Emma Harris here.

ASSISTANT: I found your previous reservation, so please help me with the airport codes?

USER: Source airport code is AUS and destination airport code is PHL.

ASSISTANT: Could you please share your new travelling dates?

USER: The travelling dates are from 04/19 to 04/21.

ASSISTANT: Ok, let me check for the availability of flight.

USER: Ok fine.

ASSISTANT: Emma, I found a flight with price fare 200 and the connection limit is 1 with UA airline.Would you like me to proceed with the booking?

USER: Yes, please proceed booking.

ASSISTANT: Your booking is confirmed with 1018 flight number.

USER: Thank you for your help.

ASSISTANT: You are welcome. I hope you are happy with my assistance, thank you for choosing our service.