You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Larry Taylor, want to travel from EWR TO LAS. Please help me in booking my ticket.

ASSISTANT: Sure, may I know your trip dates?

USER: Sure, my trip dates are from 04/06 to 04/08.

ASSISTANT: Do you have any other requirements?

USER: My return time will be in the afternoon and I need a connecting flight.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.