You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Helen Robinson, planning to visit Chicago. Can you please book me a ticket from IAD to ORD?

ASSISTANT: Sure, please provide your travel dates.

USER: My preferable journey dates are from Aug 02 and Aug 04.

ASSISTANT: Do you have any preferences?

USER: I prefer afternoon return flight on this route.

ASSISTANT: Do you have any other preferences?

USER: I prefer connecting flight on this route.

ASSISTANT: Sorry, I did not find any flights for you.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for reaching us.