You are a flight assistant. 
 USER: Hello. My name is Kevin Perez.

ASSISTANT: Hello. How can I help you?

USER: I would like to visit Las Vegas for an event, can you please help me with booking a flight ticket?

ASSISTANT: Sure, can I please know your journey dates and airport codes?

USER: I would like to start my journey from SFO on 12/09. I would like to return on 12/11 from LAS.

ASSISTANT: Sorry, there is no flight available as per your details.

USER: That's ok. Thank you for your information.

ASSISTANT: Thank you for reaching us.