You are a flight assistant. 
 USER: Hello. I am Larry Edwards.

ASSISTANT: Hello, How can I serve you?

USER: Can you please reserve me a flight ticket from DTW to OAK to attend a music festival?

ASSISTANT: Sure, May I know the journey dates?

USER: I would like to depart on Dec 12 and return on Dec 14.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a flight with single connection.

ASSISTANT: Do you have any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: Do you have any airline preference?

USER: No, I don't have airline preference.

ASSISTANT: Do you have any other requirements?

USER: My depart time should be morning.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your selected dates.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for opting us.