You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book a flight ticket form ATL to DTW. Could you help me in booking?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: My travelling dates are from June 20 - 22.

ASSISTANT: Ok, please share me your name.

USER: Christopher Anderson.

ASSISTANT: Ok, do you have any specifications?

USER: I prefer for economy class with normal-cost airline and connecting flight.

ASSISTANT: Sorry, no flights are available on your route for your specifications.

USER: That's ok, no problem. Thank you.

ASSISTANT: Welcome, have a nice day.