You are a flight assistant. 
 USER: Hello, I am David Turner.

ASSISTANT: Hello, how may I serve you the best today?

USER: I am planning to visit a Times Square in New York, can you help me in booking a flight ticket from Detroit?

ASSISTANT: Sure, may I know your airport codes please?

USER: My source and destination airport codes are MI - DTW, NY - JFK.

ASSISTANT: Ok, when did you scheduled to travel & return?

USER: My departure day is 05/13, return day is 05/15.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for remaining so positive, we are unable to provide you flight in between your journey points due to terminal up gradation at your destination airport.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.