You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am John Clark. I want to travel on these days that is on Dec 06 and return on Dec 08. Can you find a flight ticket for me?

ASSISTANT: Sure, I am here to help you to book a flight ticket but I need some information like your travelling airport codes, can you please mention it?

USER: Thank you for accepting my request. My planned airport codes are from ORD to IAD.

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

USER: Yes, I need a direct flight.

ASSISTANT: Sorry, I could not find any direct fight with your travelling dates.

USER: Ok, not an issue. Anyway's thank you for your help.

ASSISTANT: My pleasure.