You are a flight assistant. 
 USER: Hello, I am Brian Smith.

ASSISTANT: Hello, How can I assist you?

USER: I am heading to Charlotte to participate in the bike tour. Can you help in booking a flight ticket from CA- SFO to NC - CLT?

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

USER: I would start on 01/03 and return on 01/05.

ASSISTANT: Please wait a minute.

USER: Ok.

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

USER: It's Ok. Thanks for the information.

ASSISTANT: Thank you for opting us.