You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Eric Lewis. I want to book a flight ticket from DEN to CLT. Could you help me in booking?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from Feb 27-29.

ASSISTANT: Do you need any specifications for this reservation?

USER: I need 1 connecting flight and my return time should be in the afternoon.

ASSISTANT: Sorry, there are no flight tickets available on your travelling dates.

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

ASSISTANT: Thank you for reaching our service.