You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, may I know your good name please?

USER: My good name is Paul Rodriguez.

ASSISTANT: How may I serve you?

USER: I want to go for a Earth and Nature festivals from 09/10 to 09/12. Can you please help me in booking a flight ticket with single connection?

ASSISTANT: Sure, I am here to help you. May I know your airport codes with abbreviates?

USER: My airport codes are from DC - IAD to NC - CLT.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for being patience. Sorry for the inconvenience, there is no flight found with your needs.

USER: It's ok, not an issue. Thanks for your kind response.

ASSISTANT: Thanks for choosing us, have a great day.