You are a flight assistant. 
 USER: Hi, I am Mary Martinez.

ASSISTANT: Hello, how can I serve you?

USER: I want to go to Las Vegas to visit High Roller with my family, can you please book a flight ticket?

ASSISTANT: Sure. Can I know your travelling dates?

USER: My preferable travel dates are from 03/16 to 03/18.

ASSISTANT: Do you have any price limit?

USER: I have a price limit of 500.

ASSISTANT: Do you have any connection limit?

USER: I have a limit of single connection.

ASSISTANT: Can you please provide airport codes?

USER: My airport codes are from CA-LAX to NV-LAS.

ASSISTANT: Thanks for the information. Unfortunately, we did not found any flights matching your requirements.

USER: Ok, I will try with an alternative. Thank you for your help.

ASSISTANT: Thanks for opting us.