You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am planning to visit New York city, can you please book me a ticket from IAD to LGA?

ASSISTANT: May I know your preferred dates of trip please?

USER: My preferable journey dates are from 09/24 to 09/26.

ASSISTANT: May I know your good name please?

USER: My name is Jeffrey Gonzalez.

ASSISTANT: Sorry Jeffrey, no flight is available on your route.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: Thank you for using our services.