You are a flight assistant. 
 USER: Hello, I am Lisa Parker.

ASSISTANT: Hello, how can I help you Lisa?

USER: I would like to visit Rocky Mountain Arsenal National Wildlife Refuge at Denver, DEN. Can you please book me a ticket?

ASSISTANT: Sure, I can book a ticket for you. May I know your travel dates on which you have planned your travel?

USER: My travel dates are from 06/25 to 06/27.

ASSISTANT: From where you would like to fly?

USER: I would like to board from Minneapolis, MN-MSP.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thanks for waiting. sorry to inform you that unfortunately there is no flights available by the given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for reaching us, have a nice day.