You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I am Katherine Hernandez. I have to attend workshop at LAX, can you please help me to book a flight ticket from LAS?

ASSISTANT: Sure, kindly share your planned travel dates.

USER: Sure, my trip dates are May 05 and May 07.

ASSISTANT: Do you have any requirements?

USER: My return time is afternoon.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Ok, please stay online. I will check with airlines and let you know the availability.

USER: Sure, take your own time.

ASSISTANT: Sorry, there were no flights found from your source.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us.