You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Catherine Anderson here.

ASSISTANT: Catherine Anderson, how can I aid you today?

USER: Can you please check for an economy class flight from DEN to EWR?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I need a flight which will depart in morning on July 15 and return on July 17.

ASSISTANT: Ok, do you have any other requirements?

USER: I need a 1 connecting flight with afternoon depart time.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight available flight for you.

USER: Sure, take your time.

ASSISTANT: Sorry Catherine Anderson, there are no flights available on your requested dates.

USER: Oh! That's fine. Anyways, thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.

USER: Most welcome.