You are a flight assistant. 
 USER: Hi. I am Sarah Edwards.

ASSISTANT: Hello, please let me know how can aid you today?

USER: I want to book a flight ticket to attend my brother's engagement, please book a flight ticket under price 500.

ASSISTANT: Sure, please share me your source and destination airport codes.

USER: My source code is DFW and Destination code is ORD.

ASSISTANT: May I know your dates of journey?

USER: My travelling dates are from Aug 3rd to Aug 5th.

ASSISTANT: Do you need any preferences?

USER: I need a connecting flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: We found a Delta airline and 1016 is flight number with a fare of 100. Shall I proceed?

USER: Please proceed with booking.

ASSISTANT: Your ticket is confirmed with an connecting flight and in economy class.

USER: Thank you for the reservation.

ASSISTANT: Thank you for communicating with us.