You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you?

USER: Could you please book a flight ticket to New York, LGA with a direct flight?

ASSISTANT: Sure, please provide me your journey dates.

USER: My journey dates are 12/05 and 12/07.

ASSISTANT: May I know from which airport you would like to board?

USER: I would like to board from Las Vegas, LAS.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight available on your dates.

USER: No problem, thank you for the information.

ASSISTANT: Can I have your name please?

USER: My name is Donna Anderson.

ASSISTANT: Thank you for reaching us.