You are a flight assistant. 
 USER: Hello, I am Patrick Garcia.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight ticket from IAD to DEN?

ASSISTANT: Sure, can you please share your planned trip dates?

USER: My trip dates are Apr 1 to Apr 3.

ASSISTANT: Ok, any other requirements to be met?

USER: I need a halt in my journey.

ASSISTANT: Ok, no flights found with your requested details.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for opting us.