You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am David Thompson. I want to book a flight ticket from IL-ORD to NY-EWR. Can you help me?

ASSISTANT: Sure, can I know your preferable dates?

USER: 08/16 and 08/18 are my travelling dates.

ASSISTANT: Sorry, no flights available with given schedule.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching us.