You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I guide you for today?

USER: I am Brian Brown here, I want to reserve my ticket from DEN to DCA, can you please help me?

ASSISTANT: I am glad to help you about your flight ticket booking. Can you please provide your planned dates of journey?

USER: Sure, my dates of travel is from 09/19 to 09/21. Please make sure that the connections limit is 1.

ASSISTANT: Sorry to say Brown, there is no flights which can travel on your planned dates of journey.

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

ASSISTANT: My pleasure, thank you for reaching out here.