You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Dennis Adams want to meet my sister in IAH. Can you book a ticket from DCA?

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

USER: My planned dates are 07/20 and 07/22.

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

USER: I need a connecting flight.

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

USER:  Ok, thank you for your help.

ASSISTANT: Thank you for reaching us.