You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you now?

USER: I am Linda Thompson want to attend a business conference at New York, can you help me to book a direct flight?

ASSISTANT: Sure, can you please mention the travelling dates of your journey?

USER: Sure, my travelling dates will be 12/15 and 12/17.

ASSISTANT: Ok, may I know the airport codes please?

USER: Yes, I want to fly from ORD to LGA.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no direct flight.

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us.