You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you now?

USER: I am Jennifer Hernandez want to visit Boston, can yo book a ticket with price under 200?

ASSISTANT: Sure, can you please mention the airport codes of your journey?

USER: Sure, I want to fly from ORD to BOS.

ASSISTANT: May I know the travel dates please?

USER: Yes, my travelling dates will be 12/22 and 12/24.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there are no flights found on your requested dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us.