You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Richard Hill. There is a beautiful place in Oakland that is Lake Merritt, I want to visit that place in this winter season with my friends. Can you help me?

ASSISTANT: May I know your travelling dates?

USER: My departure date is 01/29 and I want to return on 01/31.

ASSISTANT: May I know your airport codes?

USER: My origin airport code is MSP and destination airport code is OAK.

ASSISTANT: Sorry, there is no flight available at your request.

USER: Oh it's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us. Have a nice day.