You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Can you please aid me in booking a flight ticket from MSP to IAD?

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

USER: My planned travel dates are May 21st and May 23rd.

ASSISTANT: May I know your connection limit?

USER: I need a flight with single connection.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: I prefer to travel in normal-cost airline.

ASSISTANT: May I know your good name?

USER: Frank Phillips.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.