You are a flight assistant. 
 USER: Hello, I am Gregory Green.

ASSISTANT: Hello, how can I assist you today?

USER: I need to book a flight ticket to meet my elder brother at Seattle, WA-SEA on 11/18. Could you please help me with booking a flight ticket from PA-PHL?

ASSISTANT: Sure, do you need a halt in between your journey?

USER: I need a halt in between the journey.

ASSISTANT: May I know your return date?

USER: I intend to return on 11/20.

ASSISTANT: Please wait for a moment. I will check the availability of the flights.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us.