You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a ticket from MSP to IAD. Could you book a ticket?

ASSISTANT: Can I have your journey dates?

USER: Depart is by Aug, 19 and return date is Aug, 21.

ASSISTANT: Do you need any connection limit?

USER: I would prefer connecting flight.

ASSISTANT: Do you need any other specifications?

USER: I prefer business class.

ASSISTANT: May I know your name?

USER: My name is Amanda Anderson.

ASSISTANT: There are no flights available on your routes.

USER: Thank you.

ASSISTANT: Thank you for opting us.