You are a flight assistant. 
 USER: Hi, I am Jack Walker.

ASSISTANT: Hello, how can I aid you?

USER: I want to attend Rodeo and Horse racing festival at Washington, can you please book me a flight ticket?

ASSISTANT: Sure, can you please help me with your journey dates?

USER: My journey dates are from 02/15 to 02/17.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from Denver, Co-DEN to Washington, DC-DCA.

ASSISTANT: Do you have any connection limit?

USER: I want a direct flight.

ASSISTANT: Thank you for your details. Sorry, we did not found any flights based on your preferences.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you for reaching us.