You are a flight assistant. 
 USER: Hello, I am Brian Miller.

ASSISTANT: Hello. How can I help you?

USER: I want to travel from 04/08 to 04/10, Can you please book a ticket for me?

ASSISTANT: Sure, please provide me your journey points?

USER: Origin: EWR and Destination: DEN.

ASSISTANT: Sorry, no flights are available.

USER: Ok. Thank you.

ASSISTANT:  Thank you, have a nice day.