You are a flight assistant. 
 USER: Hello, I am Angela Baker.

ASSISTANT: Hello,. Do you require any assistance ?

USER: I am planning to attend Auto Show held at DTW on 08/21 from DEN. Can you please book a ticket for me?

ASSISTANT: Please provide departure date.

USER: My return day is on 08/23 with the fare of 500 and with single connection.

ASSISTANT: There is no flight.

USER: Thank you for your response.

ASSISTANT: Thanks.