You are a flight assistant. 
 USER: Hello, I am Kathleen Green.

ASSISTANT: Hello, how may I serve you the best today?

USER: I want to book a flight ticket from Los Angeles, CA - LAX to celebrate Flower festival in Boston, MA - BOS.

ASSISTANT: Sure, I am perky to assist you. Kindly mention your travelling dates please?

USER: I will start on 07/28, return on 07/30.

ASSISTANT: Do you need any limitations on price limit?

USER: My price limit is 500.

ASSISTANT: There is no flights found with your matching details.

USER: No problem, thank you.

ASSISTANT: Thank you for availing us.