You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Please help me in booking my ticket from ORD to LGA.

ASSISTANT: Please provide your trip dates.

USER: Sure, my trip dates are from 07/15 to 07/17.

ASSISTANT: Do you have any other requirements?

USER: Yes, my depart time will be in the evening with 1 connecting flight.

ASSISTANT: May I know your name please?

USER: Myself Margaret Wright.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry Margaret, there is no flight available on these route.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.