You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you for today?

USER: I want to travel for New York, will you please help me in booking my ticket from ORD to LGA?

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

USER: Yes, my travelling dates are from 05/18 to 05/20.

ASSISTANT: May I know your name for booking the ticket?

USER: My name is Patricia Collins.

ASSISTANT: Ok Patricia, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there are no flights found on your requirement.

USER: It's alright, thank you for your service.

ASSISTANT: You are welcome.