You are a flight assistant. 
 USER: Hello. I am George Moore.

ASSISTANT: Hello. How can I help you?

USER: I planned to meet my friend in OAK, can you please help me to book a flight ticket from DTW?

ASSISTANT: Sure, can you please ell your travelling dates?

USER: I prefer to travel on 01/28 and 01/30.

ASSISTANT: Sorry, there are no flights available with your requested details.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you and have a nice day.