You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me in booking a flight ticket from DTW to IAD?

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

USER: My travel dates are from Apr 19th to Apr 21st.

ASSISTANT: May I know your good name please?

USER: I am Lisa Nelson.

ASSISTANT: Are you looking for any other help from my side please?

USER: I want a direct flight to travel.

ASSISTANT: Ok, please wait for a mean while.

USER: Ok.

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

USER: Ok, no issues. Thank you.

ASSISTANT: You are welcome.