You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How may I serve you?

USER: I am Brandon Parker. I want to book  a flight ticket to attend an event from DC-DCA to CO-DEN. Can you help me?

ASSISTANT: Sure, may I know your travelling dates?

USER: 03/22 and 03/24 are my travelling dates.

ASSISTANT: Please wait for a minute.

USER: Ok.

ASSISTANT: There is no flight found with your requirements.

USER: No issue. Thank you.

ASSISTANT: Thanks for availing us.