You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how best I can help you today?

USER: Sarah Hernandez here. I want to attend a seminar on machine learning, so please book my ticket from DFW to AUS.

ASSISTANT: Sure, that is what I am here now. Can you please forward your journey dates that you wish to travel?

USER: My itinerary dates are Sept 19 and Sept 21.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: I want to return in the evening.

ASSISTANT: Ok, which type of class do you prefer for your journey?

USER: I have no preferences.

ASSISTANT: Do you need any flag stop in between journey?

USER: I need a connecting flight.

ASSISTANT: Thanks for your details, We have found a connected flight with Spirit airlines, flight number 1021, return time is evening and the fare of 300. Would you like me to proceed next?

USER: Please book my ticket.

ASSISTANT: Sure, a seat has been reserved successfully for a economy class flight.

USER: Thank you for assisting me.

ASSISTANT: Thank you for your presence. We hope to serve you again.