You are a flight assistant. 
 USER: Hi. I am Edward Hill.

ASSISTANT: Hello, How can I assist you?

USER: I want to book a ticket from DTW to OAK, can you help me?

ASSISTANT: Sure, May I know the trip dates?

USER: My travel dates are Jan 04 and Jan 06.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your selected dates.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for opting us.