You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I want to book a flight ticket on 06/24 and return on 06/26, can you help me with it please?

ASSISTANT: Sure. May I know your name?

USER: Yes, my name is Robert Walker.

ASSISTANT: To proceed booking I need your airport codes.

USER: Ok, my airport codes are PA-PHL and CA-LAX.

ASSISTANT: Please, wait.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flights found on your given requirements.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you.