You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you today?

USER: My name is Justin Roberts. Due to business trip, I need a ticket from Las Vegas, NV-LAS to Los Angeles, CA-LAX.

ASSISTANT: Sure. Do you have any specifications?

USER: Ticket price limit is 5000.

ASSISTANT: To proceed booking I need your travelling dates.

USER: I will return on 04/18 and departure will be by 04/16.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Thanks for being patience, there is no flights found with your requirements.

USER: Thanks for the help.

ASSISTANT: Thank you.