You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I Know your name?

USER: I am Alexander Green.

ASSISTANT: How can I assist you?

USER: I want a direct flight to Philadelphia to visit my uncle house. Can you help me?

ASSISTANT: Sure, I can help you. Provide me your travelling dates.

USER: I will start my journey on 05/21 and returning on 05/23.

ASSISTANT: Can I know your airport codes?

USER: I need a flight from New York, NY-JFK to PA-PHL.

ASSISTANT: Unfortunately, there are no flights found according to your given requriments.

USER: Ok, thank you for the details.

ASSISTANT: Thank you for picking us.