You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you for the day?

USER: Can you help me to book a connecting flight from SFO to DTW?

ASSISTANT: Sure, do you have any class preference?

USER: No.

ASSISTANT: May I know your good name?

USER: I am Brian Miller.

ASSISTANT: In which airline do you prefer to travel?

USER: My airline preference is normal cost.

ASSISTANT: Could I have your journey dates, please?

USER: My travelling dates are 09 and 11 of Jan.

ASSISTANT: Is there any other specifications?

USER: I prefer to depart and return in the evening.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there are no flights available as per your requirements.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for opting us.