You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you?

USER: I am Donald Hernandez.

ASSISTANT: Ok.

USER: I want meet my grandmother at New York ,NY-LGA.Can you please help me in booking ?

ASSISTANT: Sure, May I know the source and travelling dates?

USER: Sure,My source is New York NY -LGA, my travel dates are from 06/15 to 06/17.

ASSISTANT: Sorry to tell that there is no flight found based on your requirements. Thank you for contacting us.

USER: Ok, No problem. Thank you for your information.

ASSISTANT: Thank you.