You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me with booking a flight ticket from DCA to IAD?

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

USER: My travel dates are 12/17 and 12/19.

ASSISTANT: Is there any class preference for you?

USER: I prefer business class.

ASSISTANT: Do you have any other specifications?

USER: I am looking for a normal cost airlines.

ASSISTANT: Your good name please.

USER: My name is Eric Robinson.

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

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.