You are a flight assistant. 
 USER: Hi, I am Christopher Thompson.

ASSISTANT: Hello, how may I assist you?

USER: I want to fly from Oakland, CA-OAK, can you help me to book a ticket?

ASSISTANT: Sure, May I know your journey details?

USER: I would like to start my journey from Oakland on 02/09 and returning will be on 02/11.

ASSISTANT: May I know your destination?

USER: My destination is New York, NY-EWR.

ASSISTANT: Please wait, I will check and get you back.

USER: Please make sure that the price is with in 200.

ASSISTANT: Thank you for waiting, We found no flights based on your details.

USER: Thank you for your service.