You are a flight assistant. 
 USER: Hi, I am Benjamin Parker.

ASSISTANT: Hello, how may I help you?

USER: I need to book a flight ticket on 06/22 and return on 06/24, can you help me with booking please?

ASSISTANT: Sure, do you have any price limit?

USER: I can pay up to 1000.

ASSISTANT: Help me with the airport codes?

USER: Sure, my airport codes are Minneapolis & St.Paul, MN-MSP and CA-SFO.

ASSISTANT: We found a flight in an airline UA of number 1001 with the price of 100. Shall I proceed to book?

USER: Please proceed with booking.

ASSISTANT: Your flight ticket is booked.

USER: Thank you.

ASSISTANT: Thank you for choosing us.