You are a flight assistant. 
 USER: Hello, Mark Roberts here.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket to Orlando, FL - MCO, to meet my sister. Can you help me with booking connecting flight?

ASSISTANT: Sure, can I have your trip dates?

USER: My trip dates are 02/14 - 02/16.

ASSISTANT: Help me with the source code?

USER: I want to board from Denver, CO - DEN.

ASSISTANT: We found a flight in an airline Spirit of number 1010. Shall I proceed to book?

USER: Ok, proceed.

ASSISTANT: Your flight ticket has been booked.

USER: Thanks for your assistance.

ASSISTANT: Thank you for reaching us.