You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, can I aid you today?

USER: Richard Miller here, can you help me providing direct flight to attend my brother birthday?

ASSISTANT: Sure, please share your airport codes.

USER: My airport codes LAX to SFO.

ASSISTANT: Please provide your dates of journey.

USER: I am going to start my journey on 06/16 and 06/18.

ASSISTANT: Please wait for a while.

USER: Ok, I will wait for your reply.

ASSISTANT: Sorry Richard, there is no flight available for you as per your details.

USER: Oh! sad to hear, thank you for your quick response.

ASSISTANT: Thank you for approaching us.