You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: My name is Ronald Martin. I need to book a flight ticket from ORD to DCA. Please help me in booking a flight ticket.

ASSISTANT: Sure, I will help you with it.

USER: Thank you.

ASSISTANT: May I know when are you willing to travel?

USER: My journey dates are from 12/06 to 12/08.

ASSISTANT: Do you prefer a halt between your journey?

USER: Yes, I prefer a halt.

ASSISTANT: Please let me know if you have any other preferences?

USER: No, I do not have any other preference.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: I am sorry to inform you that there is no flight available on given dates from you.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us, we hope to serve you better next time.