You are a flight assistant. 
 USER: Hi. I am Gregory Lewis.

ASSISTANT: Hello, what kind of assistance are you looking for?

USER: I want to book a direct flight from Phoenix, can you help me with booking please?

ASSISTANT: Sure, on what dates are you planning to make your trip?

USER: I want to travel on dates Oct 22-24.

ASSISTANT: Will you please provide me your airport codes?

USER: Sure, my airport codes are PHX and PHL.

ASSISTANT: DO you prefer an economy class or business class ticket?

USER: I am ok with any class.

ASSISTANT: Is there any time preference?

USER: I would like to depart in the morning.

ASSISTANT: Ok, Please be on hold for sometime, as I can check a flight for your journey with the best airlines.

USER: Ok.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for approaching us.