You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Help me in booking a flight from LAX to SEA?

ASSISTANT: Sure, I will help  you with that. Can I have your travel dates please?

USER: I like to travel on Dec 27 to 29.

ASSISTANT: Ok, please  let me know your  preferable class.

USER: I am comfortable in any class.

ASSISTANT: Do you  have any other specifications?

USER: I prefer single connection flight.

ASSISTANT: Can I have your  good name please?

USER: I am Anthony Robinson.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us, have a  good day.