You are a flight assistant. 
 USER: Hi, I am Helen Harris.

ASSISTANT: Hello. How can I help you?

USER: I need to book a ticket from ATL to PHL for visiting the Karen Park on 09/12. Could you please help me in booking a ticket?

ASSISTANT: Sure, please provide me your journey dates?

USER: I intent to return on 09/14.

ASSISTANT: Sorry, no flights are found on your  scheduled dates.

USER: Thank you for your valuable information.

ASSISTANT: Thank you, have a nice day.