You are a flight assistant. 
 USER: Hello, I am Rebecca Young.

ASSISTANT: Hello, how can I aid you today?

USER: I need to book a ticket with connecting flight, Can you please help me for booking from LAX to ORD?

ASSISTANT: Sure. When are you planning to travel?

USER: My depart is on 05/21 and return on 05/23.

ASSISTANT: Do you have any preferences?

USER: My price limit is 500.

ASSISTANT: Thank you for waiting. Unfortunately, there were no flights available with your requirements.

USER: No problem, thank you.

ASSISTANT: Thank you for approaching us.