You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I want to attend a Marriage in Oakland. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am oblige to help you with that. Can you please provide your preferable dates of travelling?

USER: My travelling dates are Jan 19 and Jan 21.

ASSISTANT: May I know your origin and destination airport codes for booking?

USER: My airport codes are DTW and OAK.

ASSISTANT: Do you have any connection limit?

USER: I prefer nonstop flight.

ASSISTANT: Is there any particular timings in your departure and arrival?

USER: I want to departure on morning.

ASSISTANT: Do you have any other preferences?

USER: No, I don't have any other preferences.

ASSISTANT: Can I know your name to book the flight ticket?

USER: My name is Nicole Hill.

ASSISTANT: Please wait a moment to check the flights.

USER: Ok, I will wait.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your requested dates of travelling.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching to our services, hope you have a great day.