You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I am planning to visit San Francisco, can you please book me a ticket from JFK to SFO?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My preferable journey dates are Mar 01 and Mar 03.

ASSISTANT: Ok, could I have your name please?

USER: My name is Janet Harris.

ASSISTANT: Ok, please allow me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: You are welcome.