You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Brain Young here. I need to travel from LAX to DTW to attend a business meeting, can you please help me in booking a flight ticket?

ASSISTANT: Ok, on what dates you are planning to travel?

USER: Sure, my journey dates are from 12/28 to 12/30.

ASSISTANT: Please give me some time to check it.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no flight for you on your preferable dates.

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

ASSISTANT: Thanks for approaching us, have a nice day.