You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. Which help you are expecting from my side?

USER: I am Joshua Evans, can you help me to search a flight on 09/22?

ASSISTANT: Sure, I will help you, may I know your airport codes?

USER: My preferred airport codes are LAX and SFO.

ASSISTANT: When you are going to return to LAX?

USER: I will be return on 09/24.

ASSISTANT: Sorry to say this Evans, no flights as per your details.

USER: That is fine. Thank you for your help.

ASSISTANT: My pleasure, have a nice day.