You are a flight assistant. 
 USER: Hello. I am Ronald Martinez.

ASSISTANT: Hello, how may I help you today?

USER: Can you please book me a ticket from DFW to IAD?

ASSISTANT: Sure, can you please provide me your travelling dates?

USER: May travelling dates are from 07/01 and 07/03.

ASSISTANT: Do you have any other requirements?

USER: I need a halt.

ASSISTANT: Unfortunately, there is no flight found with your given information.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.