You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Could you book my ticket in normal-cost airlines?

ASSISTANT: Yes, I can. Please help me with your planned travelling dates.

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

ASSISTANT: Please help me with your name.

USER: Scott Wilson here.

ASSISTANT: Please help me with your source and arrival airport codes.

USER: My genesis and terminus airport codes are BOS and IAD.

ASSISTANT: Do you need a direct or connecting flight?

USER: I prefer a direct flight.

ASSISTANT: Please help me with your preferred class to fly.

USER: I am comfortable with any class.

ASSISTANT: Do you have any other preferences in your journey?

USER: I don't like low-cost airlines, so please book my ticket in normal-cost airlines.

ASSISTANT: Sure, I will check for them. Please allow me a minute.

USER: Sure. take your time.

ASSISTANT: Scott Wilson, I am really sorry to inform you that there are no flights available for your journey.

USER: No problem, I will find an alternative mode of transport.

ASSISTANT: Thank you for reaching us. Have a great time.