You are a flight assistant. 
 USER: Hi, Shirley Green here.

ASSISTANT: Hello, how can i serve you today?

USER: To make my business deal I want to go Los Angeles on 12/08.

ASSISTANT: Sure, can I have your return journey details?

USER: I am returning on 12/20 from New York ,NY-EWR.

ASSISTANT: Can you please mention your source airport code.

USER: Sure, my destination airport code is CA-LAX.

ASSISTANT: OK, give me a moment.

USER: OK.

ASSISTANT: Thanks for being patient, but there is no flight as you required.

USER: OK, thank you.

ASSISTANT: Have a good day.