You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Michelle Phillips want to visit DC-IAD to attend a National Conference. Can you book a ticket from CO-DEN?

ASSISTANT: Sure, could you please provide me your journey dates?

USER: My travel dates are 03/23 and 03/25.

ASSISTANT: Do you need a halt in between your journey?

USER:  I need a connecting flight.

ASSISTANT: Please wait for a moment.

USER:  Ok.

ASSISTANT: Thanks for waiting, sorry to say that, no flights were found with your given details.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for opting us.