You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: I am Rebecca Lee.

ASSISTANT: Ok.

USER: I would like to travel from Oakland-OAK to Detroit-DTW to meet my brother, can you help me in booking?

ASSISTANT: Sure, can you please mention the travelling dates of your journey?

USER: I am departing on 12/31 and return on 01/02.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry Rebecca, there are no flights found on your requested dates.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for approaching us, have a nice day.