You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I provide assistance for you?

USER: Can you please help me to book my flight ticket from ATL to LGA?

ASSISTANT: Sure, may I know your travelling dates to book your ticket?

USER: I would like to depart on 12/15 and return from LGA on 12/17.

ASSISTANT: Ok, kindly share your price limit to proceed further.

USER: My price limit is 500.

ASSISTANT: Sorry, I regret to say that no flights were available on your dates.

USER: So sad to hear that, anyway thank you for checking.

ASSISTANT: You are welcome. Have a pleasant day. May I know your name for documentation purpose?

USER: Sure, my name is Mary Jackson.

ASSISTANT: Thank you.