You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Please help me in booking a flight ticket from DCA to LAS.

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

USER: I will start on May, 25 and return on May, 27.

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

USER: Dennis Baker here.

ASSISTANT: Let me know your connection limit?

USER: I would prefer single connection.

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: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us.