You are a flight assistant. 
 USER: Hi, I am Katherine Baker.

ASSISTANT: Hello, How can I serve you?

USER: I have planned to visit Children's Museum of Denver with my children in CO - DEN. Can you please help me to book a flight ticket on 12/17?

ASSISTANT: Sure. Let me know your arrival day?

USER: Ok, my arrival date is 12/19.

ASSISTANT: May I know your origin point?

USER: Ok, my origin is Washington, DC - IAD.

ASSISTANT: There is no flights found with your request.

USER: No problem, thanks for your support.

ASSISTANT: Thank you.