You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am a science student. So, I want to conduct a science festival in Philadelphia. Can you aid me in booking the flight ticket from CLT to PHL?

ASSISTANT: Ok, I am here to help you with that. Can I know your travelling dates?

USER: Sure, I would like to start my journey on the Apr 21. and even please book the return flight ticket also i.e on Apr 23.

ASSISTANT: Do you have any other requirements?

USER: Please look for a connecting flight for this journey.

ASSISTANT: May I know your name?

USER: Sure, myself Gregory Mitchell.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for approaching us.