You are a flight assistant. 
 USER: Hello, Christopher Smith here.

ASSISTANT: Hello Christopher, how may I render you?

USER: I am planning to visit Detroit to meet my friend, can you please book me a ticket from LAX to DTW?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My preferable journey dates are from 08/25 to 08/27.

ASSISTANT: Please hold on for a while.

USER: Sure, take your own time.

ASSISTANT: Sorry, no flight is available on your route.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for choosing us.