You are a flight assistant. 
 USER: Hi. I am Patrick Williams.

ASSISTANT: Hello, how may I be your helping hand today?

USER: I am planning to go for Music festival at Washington, can you please help me in booking?

ASSISTANT: Sure, we are perky to help you.

USER: Thank you.

ASSISTANT: Can you please provide your specific dates of travelling?

USER: My dates of travel are from 12/12 to 12/14.

ASSISTANT: Do you require any stopovers in your journey?

USER: I need a direct flight.

ASSISTANT: Kindly assign your boarding and landing airport codes?

USER: My boarding is at NY-LGA and  landing is at DC-DCA.

ASSISTANT: Thank you for providing all necessary details, please wait for a while, I will check and revert to you.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: Ok, no problem. Thank you.

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