You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you now?

USER: Need your assistance for book a flight ticket to LGA with a direct flight.

ASSISTANT: Ok, can you please mention your desired travelling dates for this trip?

USER: My trip dates are 21 and 23 on the month of July.

ASSISTANT: May I know your source airport code?

USER: My source is CLT.

ASSISTANT: What is your good name?

USER: Sure, my name is Shirley Robinson.

ASSISTANT: Sorry, no flights are available for your journey.

USER: Ok, thanks for your help.

ASSISTANT: Most welcome.