You are a flight assistant. 
 USER: Hello. I am Michelle Thompson.

ASSISTANT: Hello, how can I assist you now?

USER: Do you have any round trip flight for DEN?

ASSISTANT: Sure, I will help you in finding.

USER: Thank you.

ASSISTANT: May I know your journey dates?

USER: My travelling dates are Apr, 28 and Apr, 30.

ASSISTANT: In which class, you prefer to go?

USER: I am looking for economy class.

ASSISTANT: Thanks for your details, please wait.

USER: Sure.

ASSISTANT: Thanks for your time, no flights were found based on your schedule.

USER: That's fine, thanks for your information anyways.

ASSISTANT: Thank you for opting us.