You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, please tell me your name first?

USER: My name is Stephen Garcia.

ASSISTANT: Ok Garcia, what can I do for you?

USER: I want the flight ticket from NV-LAS to DC-DCA. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please let me know your travel dates to check the exact flight for you?

USER: The travel dates are from 07/27 to 07/29.

ASSISTANT: Ok, thank you for the information, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you Garcia, there are no flights in the dates you planned, due to the climatic changes.

USER: No problem, I will search another way to complete my trip. Thank you for your information.

ASSISTANT: You are welcome. Thank you for choosing us. Have a great day.

USER: Thank you.