You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Can you help me to book a flight ticket from PHL to CLT?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Oct, 29 and Oct, 31 are my travelling dates.

ASSISTANT: Can I know your name please?

USER: David Smith here.

ASSISTANT: Do you need any specifications?

USER: I am looking for a connecting flight.

ASSISTANT: Can I know your other requirements?

USER: No more requirements.

ASSISTANT: Sorry, there are no flights found.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.