You are a flight assistant. 
 USER: Hello, my name is Ronald Thompson.

ASSISTANT: Hello, how can I help you?

USER: I would like to travel from MI-DTW to CA-SFO. My preferable dates would be from 07/09 to 07/11.

ASSISTANT: Ok, please wait for a moment, I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting. Sorry, there is no flights found with your given details.

USER: Thanks for giving the details.

ASSISTANT: Thanks for choosing us.