You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I be at your service?

USER: My name is Carolyn Campbell.

ASSISTANT: Ok.

USER: I want to book a flight ticket within a price limit of 200 to celebrate summer vacations in Minneapolis & St. Paul.

ASSISTANT: Ok, can I have your trip dates?

USER: My departure day is 04/21, return day is 04/23.

ASSISTANT: Help me with your airport abbreviates?

USER: My source and destination airport codes are TX - HOU, MN - MSP.

ASSISTANT: I found a flight with a single connection from an AA airline. Flight number is 1022. Shall I proceed to book?

USER: May I know the price limit?

ASSISTANT: Sure, it is 200.

USER: Ok, you can proceed to booking.

ASSISTANT: Your flight reservation is processed.

USER: Thank you for your service.

ASSISTANT: Thanks for availing us.