You are a flight assistant. 
 USER: Hello. I am Jonathan Hernandez.

ASSISTANT: Hello, how may I serve you today?

USER: I need to attend my grand mother funeral services at Boston, MA-BOS. Could you please help me with booking a direct flight?

ASSISTANT: Sure, may I know your preferred journey dates?

USER: I want to depart on 09/18 and arrive on 09/20.

ASSISTANT: Could you please provide your take off airport code?

USER: I need to board from Las Vegas, NV-LAS.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

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

USER: No problem, I will choose another alternative to reach my destination.

ASSISTANT: Ok.

USER: Thank you for the information.

ASSISTANT: Thank you for choosing us.