You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I'm Jason Nelson, and I just want to plan a trip from SEA to LGA, can you please help me to book?

ASSISTANT: Sure, can you please provide me your preferable dates?

USER: Sure, my dates of travel is from 08/16 to 08/18. Do you have any ticket for me?

ASSISTANT: Just hold on for a moment.

USER: Ok.

ASSISTANT: Sorry, there is no flight available for your request.

USER: That's really sad.

ASSISTANT: Thank you for contacting us.

USER: Thank you, for your kind information.