You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I need to travel DEN and LAS, can you reserve flight ticket?

ASSISTANT: Sure, On which dates would you like me to book a flight ticket for you?

USER: My travelling dates are Nov,13 and Nov,15.

ASSISTANT: On what name, do I need to reserve your ticket?

USER: Myself John Lopez.

ASSISTANT: Let me know your connection limit?

USER: I prefer single connecting flight.

ASSISTANT: Do you have any other requirements?

USER: No.

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

USER: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the information.