You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Ruth Campbell, want to travel from DCA to DEN. Can you please help me?

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are from 01/07 to 01/09.

ASSISTANT: Ok, do you have any other requirements?

USER: Make sure, my return time should be in the afternoon with 1 connection.

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

USER: It's ok, thank you.

ASSISTANT: Most welcome.