You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Amy Phillips, I want to book a ticket from Denver, DEN to Boston, BOS. Could you help me?

ASSISTANT: Sure, I am here to help you. Could you please share your travelling dates?

USER: My journey dates are on 06/20 and 06/22.

ASSISTANT: May I know your price limit?

USER: My price limit is 500.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights found on your requested travelling dates.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thank you.