You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: Can you please help me to book a flight from IAD to LAX?

ASSISTANT: Sure, may I know your good name?

USER: My name is John Hernandez.

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

USER: I want to depart on Dec 2 and need to return on Dec 4.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight with an business class.

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

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.