You are a flight assistant. 
 USER: Hello, Dennis Davis here.

ASSISTANT: Hello, how can I aid you today?

USER: I am going to attend the business conference at Denver on 08/24, can you please help me with booking a flight ticket from New York, NY-JFK?

ASSISTANT: Sure, we can help you.

USER: Thank you.

ASSISTANT: When do you want to return on?

USER: I will return back on 08/26.

ASSISTANT: Let me know your destination point?

USER: My destination is CO-DEN.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: No issues, I will choose an another alternative. Thank you.

ASSISTANT: Ok, thank you.