You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to reserve my ticket from DTW to OAK, can you please help me in booking?

ASSISTANT: Sure, may I know your trip dates please?

USER: Sure, my planned dates of journey are from Feb, 26 to Feb, 28.

ASSISTANT: Do you have any other requirements?

USER: Yes, I want to fly in a connecting flight.

ASSISTANT: Can I know your name please?

USER: Sure, my name is Nancy Martinez.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Most welcome.