You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I'm Timothy White. I am planning to travel from CLT to LAX to attend a convocation party, can you please help me with booking a flight ticket?

ASSISTANT: Sure, I am here to help you. Timothy, may I know your journey details please?

USER: Sure, my departure date is on 07/10 and the return date is on 07/12.

ASSISTANT: Timothy, give me a moment, I will be back very soon.

USER: Ok and make sure that the price limit should not exceed 500.

ASSISTANT: Ok. Thank you for your patience.

USER: You are welcome.

ASSISTANT: Timothy, sorry to inform you that there is no flight available at your requested dates.

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

ASSISTANT: Thank you for choosing us.