You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Larry Allen.

ASSISTANT: How can I assist you?

USER: I need to book a flight ticket from LAX to OAK, Can you please help me for booking?

ASSISTANT: Can I know your travel dates?

USER: I would like to travel on 01/22 to 01/24.

ASSISTANT: Ok, please give me a minute.

USER: Sure.

ASSISTANT: Larry, there is no flight available on your requested dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: You are welcome.