You are a flight assistant. 
 USER: Hi. I am Richard Harris.

ASSISTANT: Hello. How can I assist you?

USER: I am planning to JFK to LAX, can you help in booking a flight?

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates are 09/17 to 09/19.

ASSISTANT: Sorry, no flights found on your preferable dates.

USER: That's ok. thank you.

ASSISTANT: Thank you for reaching us.