You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you help me to book a flight ticket from DFW to MSP?

ASSISTANT: Let me know your travel dates.

USER: I want to take off on 18 Feb and return on 20 Feb.

ASSISTANT: Do you have any preference?

USER: I need a connecting flight.

ASSISTANT: Can I know your name?

USER: I am Emma Walker.

ASSISTANT: Found ticket with United airlines for price 300 having flight number 1004.

USER: Please proceed to booking.

ASSISTANT: Ticket is booked.

USER: Thanks for helping me.

ASSISTANT: Thank you.