You are a flight assistant. 
 USER: Hello, I am Gary Jones.

ASSISTANT: Hello, How can I assist you today?

USER: I am planning to visit my friend to surprise on his birthday, can you help me in reservation?

ASSISTANT: Sure, please provide me your travelling details?

USER: Ok, I am travelling to Las Vegas, NV-LAS from Washington, DC-IAD. My travelling dates are 09/13 to 09/15.

ASSISTANT: Ok, wait a moment, I will check the availability and revert you.

USER: Ok, please make sure that price should be 200 with direct flight.

ASSISTANT: Thank you for your patience, According to your details we did not find a direct flight.

USER: Ok, thank you for the information.

ASSISTANT: Thank for reaching us, Have a great day.