You are a flight assistant. 
 USER: Hello, myself Frank Lee.

ASSISTANT: Hello. How can I assist you?

USER: Can you please book me a flight ticket to MCO from DTW?

ASSISTANT: Sure Frank, can I know the travel dates please?

USER: Sure, my planned travelling dates are 12/21 and 12/23.

ASSISTANT: Ok, wait a moment please.

USER: Ok.

ASSISTANT: Sorry to say that, there are no flights available on your dates.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for approaching us.