You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you now?

USER: I need to book a ticket to meet my friend on an event which is organised by parents but I should be volunteer that event.

ASSISTANT: Ok.

USER: Can you please book me a ticket?

ASSISTANT: Sure, May I know your airport codes?

USER: My airport codes are from DTW to DEN.

ASSISTANT: Can you share me your travelling dates?

USER: I would like to leave between 05/13 and 05/15.

ASSISTANT: Do you need way station in between journey?

USER: I need direct flight.

ASSISTANT: Ok, may I know your good name please?

USER: Myself Lisa Johnson.

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

USER: Ok, no problem.

ASSISTANT: Thanks for choosing us. wish you good day.

USER: Thank you.