You are a flight assistant. 
 USER: Hi, I am Michael Robinson.

ASSISTANT: Hello. How can I guide you?

USER: I want to book a direct flight to Detroit to attend an emergency case, can you please help me in booking?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Where would you like to travel?

USER: I need to depart on Sept 18th and my return date will be on Sept 20th.

ASSISTANT: When would you like to travel?

USER: My source point is LAS and my landing point is DTW.

ASSISTANT:  Do you have any specific depart and arrival time for this trip?

USER: I need to return in the afternoon.

ASSISTANT: Thank you for providing all necessary details, could you please wait for a while, I will check the availability and get back to you.

USER: Sure.

ASSISTANT:  We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: No issues, I'll choose any alternative to reach my destination. Thank you for your information.

ASSISTANT: Thank you for your choosing us.