You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: I am organizing a Auto show at Washington, can you please book a ticket within the fare of 5000?

ASSISTANT: Sure. I will help you. Can I have your airport codes please?

USER: I would like to travel from PA-PHL to DC-DCA.

ASSISTANT: Let me know your journey dates.

USER: My preferred travel dates are 05/04 and 05/06.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: We found that no flights available with your requirement.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: May I know your good name please?

USER: My name is Janet Johnson.

ASSISTANT: Thank you for availing us.