You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jason Wright.

ASSISTANT: How can I assist you?

USER: I want to travel from DFW to LAS. Can you book a flight ticket for me?

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

USER: I want to fly on 03/21 and 03/23.

ASSISTANT: May I know your price limit?

USER: It is 1000.

ASSISTANT: Sorry, there is no flight is available for you.

USER: That's ok.

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

USER: Anyways, thank you for your help.