You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I need a direct flight for my journey for having a check up with my family doctor in Chicago. Can you please help in booking my flight ticket?

ASSISTANT: Sure, I am here to help you. May I know your genesis and terminus airport codes?

USER: Thank you for considering my request. My genesis and terminus airport codes are PHX and ORD.

ASSISTANT: Please provide your itinerary dates.

USER: Ok, my itinerary dates are Oct 25 and Oct 27.

ASSISTANT: Do you have any specifications?

USER: No.

ASSISTANT: Please give me a moment to check for available flights.

USER: Sure, I will wait for your response.

ASSISTANT: May I know your name?

USER: Sure, my name is William Walker.

ASSISTANT: Sorry William Walker, no direct flight is available on your route.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for choosing us.