You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: My name is Amy Parker. I want to book a flight ticket from MA - BOS to CO - DEN. Please help me in that.

ASSISTANT: Sure, could you help me with your travelling dates?

USER: My trip dates are from 01/30 to 02/01.

ASSISTANT: Can you let me know your price limit?

USER: I can afford up to 500.

ASSISTANT: Sorry to say, currently there are no flights available on your travel dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for availing us.