You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you help me in booking a flight ticket from ORD to BOS?

ASSISTANT: Sure, can I know the travel dates please?

USER: I want to travel on 12/07, and return on 12/09.

ASSISTANT: May I know your name please?

USER: I am Katherine Jones.

ASSISTANT: Do you have any requirements?

USER: I prefer for economy class.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us.

USER: Thanks for the information.