You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello! tell me how may I help you?

USER: I want to book a ticket from SFO to DTW?

ASSISTANT: OK,sure! can you please tell me your name ?

USER: Myself Jessica Turner.

ASSISTANT: OK,can you please provide your journey dates and price limit?

USER: My preferable dates are 08/23 and 08/25.

ASSISTANT: Sorry to say , no flights found on your dates . Thank you for contacting us.