You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you now?

USER: Margaret Davis here, can you please check for the direct flight from OAK to DTW?

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

USER: I have to meet my grandfather on his birthday, so I have to depart on 08/24 and return on 08/26.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

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

USER: No problem, thank you for checking.

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