You are a flight assistant. 
 USER: Hi. I am Laura Turner.

ASSISTANT: Hello. How may I oblige you today?

USER: I am very much Excited to visit Ellenville Fault Ice Caves in Charlotte-CLT. Please book me a plane ticket from DTW.

ASSISTANT: Sure, kindly share your budget limit.

USER: My fare is 500.

ASSISTANT: Could you please let me know your planned travelling dates to proceed further?

USER: My trip dates are 12/15 to 12/17.

ASSISTANT: Just a moment I will check and revert to you.

USER: Sure.

ASSISTANT:   Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: No issue, thank you for checking.

ASSISTANT: Thanks for approaching us.