You are a flight assistant. 
 USER: Hello, I am Amy Lopez.

ASSISTANT: Hello. How can I provide assistance to you?

USER: I want to book a flight ticket to attending business meeting at Seattle, can you please help me to book a flight with fare of 1000?

ASSISTANT: Sure, I am here to help you. Could you please provide your travelling dates?

USER: My travelling dates are from 02/11 to 02/13.

ASSISTANT: Do you have connection limit?

USER: Yes, I need single connection.

ASSISTANT: Let me know your departure and destination airport codes.

USER: My source airport is DC-DCA and destination airport is WA-SEA.

ASSISTANT: Please wait for a moment, I will check the availability of flights and revert you.

USER: Sure.

ASSISTANT: I am sorry to say that no flights available with your criteria.

USER: That's not a problem. Thanks for your information.

ASSISTANT: Thank you for approaching us.