You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Stephen Young here.

ASSISTANT: How can I assist you today?

USER: Reserve a flight ticket for me that is from LAS to LAX. As I am planning a trip to Los Angeles for my anniversary. My price limit would be 5000.

ASSISTANT: Sure, can you please share your travel dates?

USER: My travel dates for travelling are 02/18 to 02/20.

ASSISTANT: Let me check for the availability of flight.

USER: Sure.

ASSISTANT: Stephen, there is no flight available at your requested dates.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.