You are a flight assistant. 
 USER: Hello, I am Pamela Perez.

ASSISTANT: Hello, how can I assist you?

USER: I need to attend a magic show event in IAD. Can you book me a ticket from DEN?

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates please?

USER: I would start on Dec 9th and return on 11th.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: That's Ok, thanks fro your response.

ASSISTANT: Thank you for choosing us.