You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am James Adams.

ASSISTANT: How can I assist you today?

USER: I would like to book a flight ticket from DTW to JFK, can you please help me to book a flight ticket?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Sure, my itinerary dates are Feb 16 and Feb 18.

ASSISTANT: Do you have any specifications?

USER: My airline preference is normal-cost.

ASSISTANT: Please give me a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: That's ok, thank you for your information.

ASSISTANT: Welcome, have a great day.