You are a flight assistant. 
 USER: Hi, myself Elizabeth Clark.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me in booking a flight ticket from MSP to DCA?

ASSISTANT: Sure, may I know your preferred dates of travel?

USER: My preferable travel dates are from May 15th to May 17th.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Do you have any specifications?

USER: I want to return in the afternoon. I want a stopover in between my journey.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.