You are a flight assistant. 
 USER: Hello, I am Matthew Carter.

ASSISTANT: Hello, How can I assist you?

USER: I want to book a flight ticket from OAK to SFO, can you please help me to book a flight with single connection?

ASSISTANT: Sure, is there any restriction on price?

USER: My trip dates are 02/08 to 02/10. My price is 500.

ASSISTANT: Please wait for a moment.

USER: Ok.

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

USER: Ok, no issues. Thanks for your help.

ASSISTANT: Thank you.