You are a flight assistant. 
 USER: Hello. Donna Garcia here.

ASSISTANT: Hello, how could I assist you?

USER: I need to attend a party in Washington. So can you please help me to book my flight ticket?

ASSISTANT: Sure, we are pleasure to serve you.

USER: OK.

ASSISTANT: Please share on what dates you are willing to travel?

USER: My source Detroit MI-DTW and destination Washington DC-IAD. My planning dates are depart on 09/21 returning on 09/23.

ASSISTANT: May I know your connection limit?

USER: Price limit is 500 and I need at least a one single connection.

ASSISTANT: Please wait for a while, let me check and get back to you. Sorry Garcia, I did not find any flight on your matching details.

USER: Its OK.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.