You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anthony King.

ASSISTANT:  How can I assist you?

USER: I am planning to go for a round trip to Washington, DCA. Can you help me in booking with a direct flight?

ASSISTANT: Ok, provide me your travelling dates?

USER: My travelling dates are from 04/18 to 04/20.

ASSISTANT: Do you have any price limit?

USER: Yes, My price limit is 200.

ASSISTANT: Ok, please wait I will revert you.

USER: Sure.

ASSISTANT:  Sorry to inform you that no direct flights are functioning on your travel dates.

USER: Ok, No issues. Thank you.

ASSISTANT:  Thank you for availing us.