You are a flight assistant. 
 USER: Hello.

ASSISTANT:  Hello, how may I oblige you today?

USER: Anthony Edwards here. Could you book my ticket in a direct flight?

ASSISTANT: Sure, could you please share your trip dates?

USER: My itinerary dates are Mar 28 and Mar 30.

ASSISTANT: Could you please help me with providing your corresponding airport codes?

USER: I want to travel from ORD to PHX.

ASSISTANT: Please wait.

USER: I want to depart from Chicago in the afternoon.

ASSISTANT: There is no flight with your respective dates of travel.

USER: No problem, thank you.

ASSISTANT: Thank you.