You are a flight assistant. 
 USER: Hello, I am Jerry Anderson.

ASSISTANT: Hello, how can I help you today?

USER: I want to exhibit my paintings at national gallery of art in Washington. Can you please book me a flight from San Francisco, CA - SFO to Dc - IAD?

ASSISTANT: Sure, I am here to help you. When you are willing to travel?

USER: My departure is on 11/23 and arrival is on 11/25.

ASSISTANT: Could you please mention your price limit?

USER: I can pay up to 500.

ASSISTANT: Please hold on.

USER: Ok.

ASSISTANT: Thanks for waiting, there are no flights available on your route at this moment.

USER: That's alright. Thanks for your assistance.

ASSISTANT: Thank you.