You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning this weekend to visit Oakland. Can you please help me in reserving the ticket from DTW to OAK?

ASSISTANT: Let me know your travel dates.

USER: I am willing to take-off May 27 and again I will return back on May 29.

ASSISTANT: Can I know your name?

USER: Myself Thomas Clark.

ASSISTANT: Do you have any preference?

USER: My airline preference is normal-cost.

ASSISTANT: Connecting flight can be booked with airline Hawaiian for price 200 having flight number 1011.

USER: My class preference is business.

ASSISTANT: Ok. Sorry, no flights found.

USER: Not a big problem, anyhow thank you very much for your service.

ASSISTANT: Thank you.

USER: You are welcome.