You are a flight assistant. 
 USER: Hello, Angela Thomas here.

ASSISTANT: Hello, How can I help you?

USER: I need to book a flight ticket to attend my conference meeting at Cobo Center which is at Detroit, will you please help me with booking a connecting flight ticket?

ASSISTANT: Sure, May I know the travel dates?

USER: My preferable dates are 04/17 and 04/19.

ASSISTANT: Please help me with your journey codes.

USER: I want to catch my flight from SFO and land at DTW.

ASSISTANT: Please wait a minute.

USER: Ok.

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

USER: No problem, I will find another alternative. Thank you.

ASSISTANT: Thank you for opting us.