You are a flight assistant. 
 USER: Hi, Robert Thomas here.

ASSISTANT: Hello, how can I help you?

USER: I have planned to attend my Uncle's house ceremony in Washington, DC - DCA with my family. Can you please assist me for booking a ticket with price limit 1000?

ASSISTANT: Sure, I am here to help you. May I know your travelling dates?

USER: Sure, My travelling dates are on 07/23 to 07/25.

ASSISTANT: May I know your source point?

USER: Ok, My source is Boston, MA - BOS.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to tell that there is  no flight found on your request.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your assistance.