You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah Clark.

ASSISTANT: How may I assist you Sarah?

USER: I am planning to attend for seminar in MSP.Can you please book a flight ticket on 02/20?

ASSISTANT: Yes, sure. May I know about your origin airport?

USER: My origin airport code is OAK. I would like to return on 02/22.

ASSISTANT: Ok. There is a flight 1019 on your preferable dates costs 100 from Delta airline with 1 connected flight. Shall I proceed for booking?

USER: Ok, please proceed to book the ticket.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you for your service.

ASSISTANT: It's my pleasure.Thank you for contacting us.