You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am looking for a flight from AUS to IAD, can you help me in booking?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, my planed travel dates are July 21 and July 23.

ASSISTANT: Do you have any class or time preferences?

USER: I would like to return my journey for the evening flight in an economy class.

ASSISTANT: Do you have any connection preference?

USER: Please look for a connecting flight.

ASSISTANT: May I know your name?

USER: Myself Rachel Lopez.

ASSISTANT: There is a connecting flight available with Frontier airline, shall I proceed?

USER: That's fine, please proceed in booking.

ASSISTANT: Your booking is done with flight number 1019. Happy journey.

USER: Thank you for the service.

ASSISTANT: You are welcome, have a nice day.