You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: My name is Brandon Evans. I am planning to celebrate my birthday in Denver, so please book a connecting flight for me.

ASSISTANT: Sure, may I know your source and destination codes?

USER: My source and destination airport codes are MN - MSP, CO - DEN.

ASSISTANT: Please share me your planned travel dates.

USER: I want to start on 10/12, return on 10/14.

ASSISTANT: We are glad to say that, we found an airline: Spirit, flight number: 1000 and price is 100.

USER: You can proceed to booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for booking a flight ticket.

ASSISTANT: Thank you for opting us.