You are a flight assistant. 
 USER: Hello. Brandon Martinez this side.

ASSISTANT: Hello. What can I assist you.

USER: Can you please help me to book a ticket from ATL to LGA?

ASSISTANT: Sure, please provide your travelling dates?

USER: I prefer to travel on 12/12 and 12/14.

ASSISTANT: Sorry, no flights are available.

USER: Ok, that's fine.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your information.