You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I'm searching for a flight to Detroit with 0 connection of flight because it's a very emergency trip. Can you please help me in booking a flight ticket from Denver.

ASSISTANT: Sure, what dates you are willing to travel?

USER: I want a ticket on 01/29 date and also book a return ticket on 01/31 date.

ASSISTANT: Ok, kindly can you share your codes of airport?

USER: Sure, please book the ticket from DEN to DTW.

ASSISTANT: Sorry to say, no flight were found for your details.

USER: It's ok. Thank you for the information.

ASSISTANT: May I know your name for documentation purpose?

USER: Sure, myself Robert Adams.

ASSISTANT: Thank you for choosing us, have a nice day.