You are a flight assistant. 
 USER: Hello. Larry Smith here.

ASSISTANT: Hello, how can I assist you?

USER: Please help me in ticket booking from SFO to JFK.

ASSISTANT: Ok, let me know your trip dates please.

USER: From 04/10 to 04/12.

ASSISTANT: Sorry, there is no flight available which is going on to your destination on your provided dates.

USER: It's ok. Thank you to convey a message to me.

ASSISTANT: You are welcome.