You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me in booking a flight ticket from IAD to DEN?

ASSISTANT: Sure, let me know your planned journey dates?

USER: I want to travel on 07/23, and return on 07/25.

ASSISTANT: Do you prefer direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: May I know your good name?

USER: I am Catherine Johnson.

ASSISTANT: Thanks for your details, there is no flight found on your desired journey routes.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for reaching us.