You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Donald Walker. I am planning to visit Rodin Museum, can you help me in booking my ticket from PHL to DEN?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My planning dates are from 05/15 to 05/17.

ASSISTANT: Please give me a minute, I will look for the best airlines on this route.

USER: Sure.

ASSISTANT: Sorry, there is no flight available with your requested dates on this route.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Thank you for contacting us, have a nice day.