You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me to book a flight ticket from MSP to IAD?

ASSISTANT: Sure, may I know your planned trip dates?

USER: Thank you. My planned travel dates are May 11 and May 13.

ASSISTANT: Do you have any connection limit?

USER: I prefer a single connected flight for my journey.

ASSISTANT: Any other requirements to be met?

USER: I am looking for a flight in the normal-cost airlines.

ASSISTANT: May I know your good name?

USER: My name is Richard Harris.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: It's ok, not a problem with that. Thanks a lot for your help.

ASSISTANT: Thank you for reaching us.