You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Laura Campbell here.

ASSISTANT: How can I assist you?

USER: I want to participate in Boston marathon, so please book my ticket from Chicago.

ASSISTANT: Ok, may I know your travel dates?

USER: My itinerary dates are May 17 and May 19.

ASSISTANT: Do you have any preferences?

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

ASSISTANT: Ok, do you have any class preferences?

USER: No.

ASSISTANT: Ok, UA airlines is providing flight with the single connection and the flight fare is 200. Can I proceed with the booking?

USER: Please proceed.

ASSISTANT: Your booking is confirmed and the flight number is 200.

USER: Thank you for assisting me.

ASSISTANT: Thank you for choosing us.