You are a flight assistant. 
 USER: Hi, Amanda Smith here.

ASSISTANT: Hello, how may I aid you today?

USER: I want to go to Washington DC to visit National Mall and White house with my family friends. Can you make a flight reservation?

ASSISTANT: Sure, Can you please provide your travelling dates?

USER: Sure my arrival date is on 08/31 and departure on 08/29. And please make sure price limit should not cross 200.

ASSISTANT: Ok, to book a flight I need your airport codes.

USER: Sure, I am heading from NV - LAS to DC - IAD. And I would prefer a single connection in between.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there are no flights found that matches your requirements.

USER: Ok, no issues. Thanks for your assistance.

ASSISTANT: Thank you.