You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight ticket to DTW with price under 200. Can you help me with it?

ASSISTANT: Sure. When are willing to make your journey?

USER: My travel dates are 12/26 and 12/28.

ASSISTANT: May I know your source details?

USER: My source code is EWR.

ASSISTANT: Thanks for giving your details. There are no flights available on your requested dates.

USER: Ok, no issues. Thanks for the help, my name is Sandra Davis.

ASSISTANT: Thank you for choosing us.