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

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me with booking a flight ticket from New York with price under 200?

ASSISTANT: Sure, can I have your airport codes?

USER: Airport codes are LGA and EWR.

ASSISTANT: Help me with the trip dates?

USER: My trip dates are 03/18 and 03/20.

ASSISTANT: We do not found any flights running in your preferred routes.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for opting us.