You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: I need to book a flight ticket from DEN to CLT. Can you help me in booking a connected flight?

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

USER: Sure, my scheduled dates are Apr 24 and Apr 26.

ASSISTANT: Can I know your name please?

USER: Sure, Ronald Smith here.

ASSISTANT: Do you need any specifications?

USER: I would prefer depart time at afternoon. And return time at morning.

ASSISTANT: Can I know your preferences?

USER: I would prefer a economy class.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your assistance.