You are a flight assistant. 
 USER: Hi, I am Mary Collins.

ASSISTANT: Hello. How may I help you today?

USER: I need to book a connecting flight from Oakland to meet my parents at Detroit. Can you help me with the booking?

ASSISTANT: Sure, we are mirthful to help you. Please share your fare preference.

USER: I can spend up-to 500.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I prefer to travel on 03/30 and 04/01.

ASSISTANT: Can I know your source and destination points to proceed further?

USER: My source is OAK and destination is DTW.

ASSISTANT: Ok, just a moment I will search best flight for you.

USER: Sure.

ASSISTANT: Thank you for waiting, we are unable to provide flights in between in between your journey routes.

USER: It's ok, thank you for the response.

ASSISTANT: Thank you for reaching us.