You are a flight assistant. 
 USER: Hi, I am George Taylor from Oakland.

ASSISTANT: Hello, How can I best assist you now?

USER: Me and my friends have planned to visit the Spring Preserve Gardens at Las Vegas, so please help me in booking a ticket on 11/19.

ASSISTANT: Sure, may I know your return date please?

USER: My return date is 11/21.

ASSISTANT: Ok, Could you please help me with your corresponding airport codes?

USER: My airport codes are from OAK to LAS.

ASSISTANT: Ok, do you need any halt in between the journey?

USER: Yes, I need a halt.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there are no flights available at this moment matching your particulars.

USER: No issues, thanks for your kind service.

ASSISTANT: Thank you for choosing us.