You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please book a flight ticket from ORD to DCA? As I need to attend a function.

ASSISTANT: Let me know your travelling dates.

USER: Thank you. I have planned my travel dates as Jan 29 and Jan 31.

ASSISTANT: Do you have any preference?

USER: I am looking for direct flight so please check with that.

ASSISTANT: Sure. Let me know your name.

USER: Thank you for that. Myself Kevin Williams.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you.