You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Anna Thompson here. I would like to travel from OAK to DTW, can you please help me to reserve my ticket?

ASSISTANT: Ok, please tell me your desired dates for your journey?

USER: Sure, my dates of journey is from 01/16 to 01/18.

ASSISTANT: Sorry to inform you, there are no flights available for you.

USER: Ok, that's fine.

ASSISTANT: Thank you for reaching our services.

USER: Thank you for your service and have a great day.

ASSISTANT: Have a great afternoon.