You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Larry Allen here.

ASSISTANT: How can I assist you?

USER: Can you please book a flight ticket from JFK to LAX?

ASSISTANT: Can I know your travel dates?

USER: Sure, I need to travel on dates of 01/14 and 01/16.

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

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: You are welcome.