You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Catherine Scott. I want to book a flight ticket to meet my best friend in Detroit DTW from LAX. Can you make a reservation for me?

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

USER: Sure, I am planning to travelling dates are on Apr 28 and return on Apr 30.

ASSISTANT: Do you have any specifications?

USER: Yes, I need one halt.

ASSISTANT: Please give me a moment.

USER: Sure, take your own time.

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

USER: That;s fine, no problem. Thank you for your information.

ASSISTANT: Welcome, have a great day.