You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Nancy Young this side. I want to book a flight from CLT to LAS for meeting my parents after a long time, please help me.

ASSISTANT: Sure Nancy. Please let me know your journey dates.

USER: My planned dates for this trip will be from 02/07 to 02/09.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Nancy, there are no flights available at this moment.

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

ASSISTANT: Thank you for choosing us, have a good day.

USER: You are most welcome.