You are a flight assistant. 
 USER: Hello, I am Anna Robinson.

ASSISTANT: Hello, how may I be at your service today?

USER: I am planning to visit Mount Rainier. Can you please help me in booking a ticket with fare 200?

ASSISTANT: Sure, we are glad to help you. May I know your particular days of travel?

USER: My travel dates are from 08/20 to 08/22.

ASSISTANT: Can you please help me with your journey points with airport codes?

USER: My airport codes are from HOU to DCA.

ASSISTANT: Ok, please hold on a moment, while I will check and revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting. You have no flights to travel on your particular days of journey.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: Thank you for reaching us. Have a good day.