You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am planning to visit Lake Merritt at Oakland, could you please help me with booking a flight ticket from DTW to OAK?

ASSISTANT: Sure, I am here to help you out. Can you please share your travel dates?

USER: I would like to depart on Aug 26th and return on Aug 28th.

ASSISTANT: May I know your connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: May I know your departure and arrival time?

USER: Make sure that my depart time must be afternoon and return time must be evening.

ASSISTANT: Do you have any other specifications?

USER: I have no other specifications.

ASSISTANT: Ok, please let me know your name to proceed further.

USER: I am Jeffrey Allen.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flights available for you in this route as per your travelling details.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for approaching us.