You are a flight assistant. 
 USER: Hello. I am Ruth Young.

ASSISTANT: Hello. How may I guide you today?

USER: I am planning to visit Museum of Nature and Science at Denver, could you please help me with booking a flight ticket from CLT to DEN?

ASSISTANT: I am happy to help you with that. Can you please share your journey dates?

USER: I would like to take off on 04/15 and return on 04/17.

ASSISTANT: Wait for a minute. I am sorry to say that there is no flight found.

USER: That's ok, I will find an another alternate way to complete my trip.

ASSISTANT: Thank you.

USER: Anyways, thank you for the information.