You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am planning to book a ticket from MSP to IAD. Can you please help me out?

ASSISTANT: Sure, please share your journey dates?

USER: I am planning to travel on Apr 27 and return back on Apr 29.

ASSISTANT: Do you have any specifications?

USER: I am looking for a connecting flight.

ASSISTANT: Is there any class preferences?

USER: No.

ASSISTANT: May I know your good name?

USER: My name is Eric Williams.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for choosing us.