You are a flight assistant. 
 USER: Hello, Linda Anderson here.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I am looking for a direct flight from Phoenix to Denver, could you book my ticket?

ASSISTANT: Sure, I will help you with this. Can you please provide your journey dates?

USER: My itinerary dates are 10/14 and 10/16.

ASSISTANT: May I know your nearest airport codes of journey please?

USER: My genesis and terminus airport codes are PHX and DEN.

ASSISTANT: Linda Anderson, there is no direct flight available on this route on your provided dates.

USER: No problem, I will find an alternative way to travel. Thank you for your help.

ASSISTANT: Thank you for contacting us.