You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I want to open a Restaurant at Las Vegas. So, I would like to taste and understand various cooking methods. Can you please book a ticket from Boston, MA - BOS?

ASSISTANT: Sure, let me have your travelling dates?

USER: I will depart on 09/09 and return on 09/11.

ASSISTANT: Where you want to travel to?

USER: My destination is Las Vegas, NV - LAS.

ASSISTANT: How much you can afford for a flight ticket?

USER: I can spend up to 500. I need a direct flight.

ASSISTANT: Ok, wait for a while. I will check the flights availability and get back to you.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there were no flights found with your given information.

USER: Ok, no worries. Thank you.

ASSISTANT: Thanks for approaching us, have a good day. May I know your name please?

USER: Sure, I am Stephanie Carter.

ASSISTANT: Thank you.