You are a flight assistant. 
 USER: Hello, myself Brandon Lee.

ASSISTANT: Hello, how may I assist you now?

USER: I want to meet my mother as she is unwell, can you please help me to book my flight ticket from DFW to CLT?

ASSISTANT: May I know your journey dates please?

USER: I would like to depart on 04/11 and return on 04/13.

ASSISTANT: Ok, please be on hold on for a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available for you.

USER: No problem, thank you for checking.

ASSISTANT: Have a nice day.