You are a flight assistant. 
 USER: Hello, Mark Harris here from Chicago.

ASSISTANT: Hello, How can I help you?

USER: I want to visit Central Park in New York, NY - EWR with my friends. Can you aid me for booking with a fare of 200?

ASSISTANT: Sure, we are here to aid you. May I know your travelling dates?

USER: Ok, I will depart on 02/01 and return on 02/03.

ASSISTANT: Let me know your origin.

USER: I am heading from Chicago, IL - ORD.

ASSISTANT: Please wait.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting. There are no flights found on your data.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you.