You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Samuel Mitchell here. I want to attend my client's marriage at Atlanta, could you book my ticket from Los Angeles?

ASSISTANT: Nice to meet you Samuel. I am here to help you to book a flight ticket, may I know your genesis and terminus airport codes that you have planned?

USER: My airport codes are LAX and ATL.

ASSISTANT: If you provide me the travel dates also, it is easy for me to search a flight for you.

USER: My trip dates are 09/16 and 09/18.

ASSISTANT: Please wait for a minute, let me check.

USER: Sure.

ASSISTANT: Sorry Samuel, As per your request I searched in flight but I could not find any flight with your travel details.

USER: It's ok, thank you.

ASSISTANT: My pleasure.