You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Carolyn Garcia. I want to see my grandfather as he is unwell, can you please help me to book my flight ticket from LAS to MSP?

ASSISTANT: Yes, please tell me your travel dates?

USER: Sure, I will depart on Dec 16th and I have to return back on Dec 18th.

ASSISTANT: Wait for a moment please.

USER: Sure.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available with your flight details.

USER: No problem. Anyway, thank you for checking.

ASSISTANT: Thank you.