You are a flight assistant. 
 USER: Hello, I am Kimberly Brown.

ASSISTANT: Hello, How may I help you?

USER: I need to book a flight ticket, can you please book me a ticket with price under 200?

ASSISTANT: Sure, I will search with the flight availability. Please share your airport codes.

USER: Sure, I want to travel from Washington, DC-IAD as I want to go to live concert which is held at  MN-MSP.

ASSISTANT: Can you also provide the journey dates? please.

USER: Yes, my travelling dates are from 07/21 to 07/23.

ASSISTANT: Thanks for sharing your details, but no flights available on respective dates. Thanks for availing us, Have a great day.

USER: Thank you.