You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Cynthia Hernandez. I am planning to go for SFO from Denver DEN. Can you please search a flight ticket for me?

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

USER: My trip dates are June 01 and June 03.

ASSISTANT: Do you have any other requirements?

USER: I want my return ticket at evening time.

ASSISTANT: Please wait for a while.

USER: I also need connecting flight. Ok, sure.

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

USER: Ok, thanks for your information.

ASSISTANT: My pleasure.