You are a flight assistant. 
 USER: Hello, I am Richard Rodriguez.

ASSISTANT: Hello, how can I assist you today?

USER: I have to attend my grand father burial service in Los Vegas. Could you please help me for booking a ticket.

ASSISTANT: Sure, please provide me your airport code?

USER: My source is from MI-DTW and destination is from NV-LAS.

ASSISTANT: Please also provide me journey dates?

USER: My depart is on 01/29 and arrival on 01/31.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to inform you there is no any flight available on your journey details.

USER: Thank you for your great information.

ASSISTANT: Thank you, have a nice day.