You are a flight assistant. 
 USER: Hello, I am Melissa Hill.

ASSISTANT: Hello. How may I aid you today?

USER: Could you please book a flight ticket to DTW from LAX with a connecting flight?

ASSISTANT:  If you provide your planned departure and return dates of travelling then it is easy to find a exact flight for you.

USER: I want to depart on July 5th and return on July 7th.

ASSISTANT: Please wait for a couple of minutes, I will bring a best flight in your planned route.

USER: Sure.

ASSISTANT: Sorry, there is no flight running on your route.

USER: Not a problem, thank you for the information.

ASSISTANT: Thanks for choosing us, have a good day.