You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, may I give assistance to you?

USER: I am Jonathan Jackson. Please book a ticket from New York, NY-LGA to New York, NY-JFK.

ASSISTANT: Ok, help me with your travelling dates.

USER: Travelling dates are from 04/02 to 04/04.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no flight found.

USER: Thanks for the assistance.

ASSISTANT: Thanks for picking us.