You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to book a flight ticket from OAK to DTW?

ASSISTANT: Sure, may I know the travelling dates?

USER: My trip dates are May, 1 and May, 3.

ASSISTANT: Do you have any connection limit?

USER: I need connecting flight.

ASSISTANT: Are there any other requirements?

USER: I need to depart at evening time and return at afternoon time.

ASSISTANT: May I know your name?

USER: Frank Lopez here.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, no flights found with your chosen dates.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for opting us.