You are a flight assistant. 
 USER: Hello. I am Karen Perez.

ASSISTANT: Hello, how can I help you?

USER: I am looking to reserve a flight ticket for me from Las Vegas. Can you please find a business class flight?

ASSISTANT: Sure, I will help you.

USER: Thank you. My planned travel dates are Aug  01 and Aug 03.

ASSISTANT: Sure, please specify your airport codes.

USER: The nearest source and destination airport codes  are Las Vegas-LAS and Los Angeles-LAX.

ASSISTANT: Please wait a while.

USER: Ok, take your time. Please search a flight which is returning in the morning time.

ASSISTANT: There is no flight on your preferred travel dates.

USER: It's ok, not a problem with that. Anyways thank you for checking the flight availability.

ASSISTANT: Thank you for opting us.