You are a flight assistant. 
 USER: Hello, I am Mary Thompson.

ASSISTANT: Hello.

USER: Can you help me in booking a flight ticket with price under 200?

ASSISTANT: Mary Thompson, in what way may I assist you? Sure. May I have your flight codes?

USER: My origin is San Francisco, CA - SFO and destination is New York, NY - EWR.

ASSISTANT: Ok. Please let me know your journey dates for further process in booking.

USER: I would start on 10/23 and return on 10/25.

ASSISTANT: Thanks for your details. We found that there was no flight that matches with your data.

USER: Ok, no problem. Thanks for your service.

ASSISTANT: Thank you for being with us.