You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to visit my uncle's house in Las Vegas, LAS. So can you find a flight from IAD?

ASSISTANT: Sure, I will find a flight for you. May I know your travelling dates?

USER: I am planning to visit my uncle's house on 07/31. So I want to leave from IAD on 07/30. And I want to return back on 08/01 from LAS.

ASSISTANT: Ok, may I know your name for further proceeding.

USER: I am Anthony Clark. Actually I am looking for the flight with connection 1 and my budget is 200. So please check with this.

ASSISTANT: Sorry for inconvenience, we didn't found any flight for your requirements..

USER: It's ok, thank you for checking.

ASSISTANT: Welcome. Thank you for reaching us.

USER: You are welcome.