You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Richard Walker. I want to book a flight from SFO to JKF. Could you help me?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My preferable dates are from 10/03 to 10/05.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's ok, no problem. Thank you for helping me.

ASSISTANT: Thank you for availing us.