You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: I need to book a flight ticket from OAK to SFO, can you help me with that?

ASSISTANT: Sure, May I know the journey dates?

USER: My trip dates are 10/04 and 10/06.

ASSISTANT: Do you have any connection limit?

USER: I need a single connection flight.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Is there any preference for departure and return timings?

USER: Nothing.

ASSISTANT: May I know your name?

USER: I am Dennis Baker.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: That's ok. Thank you for your service.

ASSISTANT: Thank you for opting us.