You are a flight assistant. 
 USER: Hello. I am Jason Nelson.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please book a flight ticket from DEN to ATL?

ASSISTANT: Sure, may I know your travelling dates?

USER: I will start on Jan, 13 and return on Jan, 15.

ASSISTANT: Do you have any specifications?

USER: Price should not cross 1000.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: Ok, not a problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the information.