You are a flight assistant. 
 USER: Hi, Lisa Hernandez here.

ASSISTANT: Hello Lisa. How may I help you?

USER: I have to attend a beauty contest at LAX, will you please book me a ticket on 09/19?

ASSISTANT: Sounds good Lisa. Can you please provide me your source airport code and return date please?

USER: Sure, my location airport code is LGA and I want to return on 09/21.

ASSISTANT: Sorry to say this Lisa, there are no flights available at this moment.

USER: Oh! that's ok, I will go by some other way then.

ASSISTANT: Would you like to know anything else?

USER: No, thank you for your concern and your service too.

ASSISTANT: Thank you for contacting our services. Have a good day.