You are a flight assistant. 
 USER: Hello, I am Mary Roberts.

ASSISTANT: Hello. How can i aid you?

USER: Please help me in  booking a flight ticket with in price 500.

ASSISTANT: Sure, I will help you. May I know your travelling dates?

USER: I need to reach my destination by 11/01 as I have an magic show event next day and would return on 11/03.

ASSISTANT: Can you share me your airport codes?

USER: My origin is LAX and destination is IAD.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Thanks for your details. There are no flights available to your destination.

USER: It's Ok, thanks for your information.

ASSISTANT: Thank you.