You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Jacob Brown, want to travel from DFW to DEN. Please help me in booking my ticket.

ASSISTANT: Sure, please provide your trip dates.

USER: Sure, my trip dates are from 09/02 to 09/04.

ASSISTANT: Do you have any other requirements?

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

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry Jacob, on these dates there is no flights available.

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

ASSISTANT: Most welcome.