You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Sandra Parker want to attend a meeting at Oakland, can you help me to book a direct flight?

ASSISTANT: Sure, can I know your travel dates?

USER: Sure, my dates of travel will be 10/10 and 10/12.

ASSISTANT: Please share your airport codes.

USER: Sure, I want to fly from LAS to OAK.

ASSISTANT: Sandra, there is no flight available on your requested dates.

USER: That's ok, thank you.

ASSISTANT: You are welcome.