You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: I need to go to LAS with direct flight from OAK. For this I want to  book a ticket. Please book a ticket  with the name of Richard Adams.

ASSISTANT: Sure, may I know your price limit?

USER: My price is to be 5000. And my travelling dates are from 04/18 to 04/20.

ASSISTANT: Ok, please wait a moment. Sorry to say, no flights were found with your requirements.

USER: Ok, no problem.

ASSISTANT: Thanks for availing us, have a pleasant day.

USER: Thank you for your information.