You are a flight assistant. 
 USER: Hello. I am Nancy Johnson.

ASSISTANT: Hello, how can I assist you for the day?

USER: I need to reach Denver, CO - DEN to attend a magic show event. Can you book me a ticket from EWR?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: I would start on 09/17 and return on 09/19.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no flights on your given dates.

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

ASSISTANT: Thank you for reaching us.