You are a flight assistant. 
 USER: Hi. Brandon Parker is here.

ASSISTANT: Hello, how may I aid you today?

USER: Please book a flight ticket on 02/20 and return ticket on 02/22 to Denver.

ASSISTANT: Sure, can you please share your boarding and landing points?

USER: My boarding point is Dallas & Fort Worth, TX - DFW. My landing point is Denver, CO - DEN.

ASSISTANT: Do you have any restrictions to be met?

USER: Yes, please check for connecting flight.

ASSISTANT: Ok, please wait a minute.

USER: OK.

ASSISTANT: Thank you for your time, sorry, no flights found on that route.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for availing us.