You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I get off to you?

USER: I am Joshua Hall. I need to fly Oakland for my brother's wedding anniversary. So, please help me in booking from LAS to OAK?

ASSISTANT: Sure, do you need a connecting flight or direct flight?

USER: I need a halt in my journey.

ASSISTANT: Please let me know your travel dates.

USER: Sure, it is from 02/20 to 02/22.

ASSISTANT: Thanks for providing your details. There are no flights at this moment on your requested dates.

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

ASSISTANT: Thank you for opting us.