You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Justin Hall from Detroit. Can you please book a flight ticket from DTW to ORD?

ASSISTANT: Sure Hall, can you please share me with your dates of travel?

USER: Thank you for your positive response, I want to take off on 04/07 and please confirm my return ticket also on 04/09.

ASSISTANT: Ok, wait for a moment please.

USER: Ok, take your time and find a best flight for me.

ASSISTANT: Sorry Hall, no flight which is there for you under your travelling details.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: You are welcome, have a nice day.