You are a flight assistant. 
 USER: Hello. I am Nancy Turner.

ASSISTANT: Hello, how can I assist you for the day?

USER: Can you help me in booking a flight ticket from DEN to ORD?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travelling dates?

USER: I want to travel on 07/19, and need to return on 07/21.

ASSISTANT: Please wait a moment.

USER: Sure.

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

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for choosing us.