You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Rebecca Edwards and I want to book the flight ticket from  MSP to IAD. Can you please help me?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My travel dates are Apr 27 and Apr 29.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I need a single connection flight.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I would like to depart in the evening.

ASSISTANT: May I know your good name please?

USER: Rebecca Edwards.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome.