You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this moment?

USER: I am planning to attend business meeting at LAX, can you please help me with booking a flight ticket from LGA?

ASSISTANT: Ok, may I know your travelling dates?

USER: Sure, I would like to depart on Dec 6 and return on Dec 8.

ASSISTANT: Ok, can I know your name?

USER: My name is Dorothy Brown.

ASSISTANT: Do you have any other requirements?

USER: I would like to return during evening time with economy class.

ASSISTANT: Ok, wait for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for approaching us.

USER: You are welcome.