You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Amy Robinson.

ASSISTANT: How can I serve you?

USER: I would like to attend Science Festival which will be held at Washington, can you please help me with booking a flight ticket within price 500?

ASSISTANT: Sure. May I know your travelling dates?

USER: Sure, I need to go on 02/16 and I will be back on 02/18.

ASSISTANT: Can you share me your airport codes?

USER: Sure, I will start my journey from MSP to reach IAD.

ASSISTANT: Do you have any preferences?

USER: Yes, I want a connecting flight.

ASSISTANT: Please wait.

USER: Ok.

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

USER: No issues, thank you.

ASSISTANT: Thank you.