You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Nicholas Davis here. I'm planning to visit Washington, can you please book a ticket from IAH to IAD?

ASSISTANT: Sure, let me know your travelling dates?

USER: Sure, my planned departure and return travel dates are 20th and 22nd of March.

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

USER: Yes, I need 1 halt in between my journey.

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

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: Thank you for reaching us.