You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am Dennis Jackson, can you help me to book connecting flight from IAD?

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

USER: My travelling dates are 09/19 and 09/21.

ASSISTANT: May I know your destination airport code of journey?

USER: Please book afternoon flight from DTW for my return journey.

ASSISTANT: May I know your class preference please?

USER: I want to travel in economy class.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight found as per your travelling details.

USER: No issues, thank you for your time.

ASSISTANT: You are welcome.