You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Could you please book a flight ticket from MSP to SFO?

ASSISTANT: Can I know your travelling dates?

USER: My travelling dates are Aug 13 and Aug 15.

ASSISTANT: Is there class preference?

USER: No.

ASSISTANT: Do you have connection specification?

USER: I need a single connecting flight.

ASSISTANT: Can I know your name?

USER: I am Scott Allen.

ASSISTANT: Found ticket with Southwest airlines for price 100 having flight number 1018. Shall I book a ticket?

USER: If the flight return in the evening, please proceed.

ASSISTANT: Ok. Your ticket is booked in an economy class.

USER: Thank you.

ASSISTANT: Thank you.