You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I support you today?

USER: I would like to Dallas to meet my friend on 10/17 and will return on 10/19, please help me with booking on these dates.

ASSISTANT: Sure, I would be happy to help you. Can you please provide your take off and landing airport codes?

USER: Its from DCA to DFW.

ASSISTANT: Do you need any halt in between your journey?

USER: Yes, I need a stop over in between my journey.

ASSISTANT: May I know your name for documentation purpose?

USER: I am William White.

ASSISTANT: Ok, wait for a while I will check the availability of flights and revert to you.

USER: Ok.

ASSISTANT: We are very sorry to notify you that there is no flight found based on your connection.

USER: Ok, thank you.

ASSISTANT: Thank you for availing us. Have a great day!.