You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me in flight ticket booking process from DTW to OAK?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: Thank you for your response, I want to take off on Oct 11 and book my return ticket also on Oct 13.

ASSISTANT: Do you have any other preferences?

USER: I will prefer direct flight.

ASSISTANT: Can I know your name?

USER: Sure, my name is Christopher Johnson.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Oh! It's ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your information.