You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Christopher Hernandez here. There is a place that is Universal Studios Hollywood, can you find a flight for me from OAK to LAS to see that place.

ASSISTANT: Sure, may I know your preferable dates to travel?

USER: My preferable dates are from 03/29 and 03/31.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your requested dates.

USER: Oh! That's really sad to hear, anyway thank you for your services.

ASSISTANT: Most welcome.