You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: I am planning to go for a round trip from to visit mountain park in Denver, can you please search a flight ticket for me?

ASSISTANT: Sure, I would be happy to help you. May I know your journey dates?

USER: My journey starts on 08/09 date and my return journey starts on 08/11 date.

ASSISTANT: Do you need any lay by in between journey?

USER: Yes, I need 1 lay by in between my journey.

ASSISTANT: Please share me your travelling airport codes?

USER: My journey starts from my work location DEN and again I have to return back to the same place DEN.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no flight found on your journey dates. May I know your good name please?

USER: Ok, myself Daniel Smith. Thank you for your help.

ASSISTANT: Thanks for reaching us and have a good day.