You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I need to travel Washington DC, can you please book flight ticket from LAS and IAD?

ASSISTANT: Sure, I am gleeful to help you in booking. Could you please provide me your travel dates?

USER: My journey dates are from 02/19 to 02/21 and my budget limit is 500.

ASSISTANT: May I know your name?

USER: Myself Laura Lewis.

ASSISTANT: Sorry to say that, there are no flight found on your preferable dates?

USER: That's not an issue, I will choose any other source to travel my place.

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