You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I address you?

USER: I am planning to reach Philadelphia on Aug 31st and my return date will be on Sept 2nd, can you help me in booking?

ASSISTANT: Sure. Can I know your name?

USER: I am Kevin Lee.

ASSISTANT: Kindly share me your airport codes.

USER: My source point is LAS and my destination point is PHL.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: I want to depart in the evening.

ASSISTANT: Thank you for providing all necessary details. Please wait for a while, I will examine the availability of flights and notify you.

USER: Sure.

ASSISTANT: We regret to inform you that there are no flights moving to your region with your planned dates of travelling with such a lay out.