You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Brenda Garcia here.

ASSISTANT: Brenda Garcia, how may I assist you with today?

USER: I want to book a flight ticket to meet my son on his birthday. So, can you please check for the flights from AUS – DTW? My travelling dates are 12/26 and 12/28.

ASSISTANT: Sure, I will help you to book a flight ticket. Thank you for the information. I am sorry to inform you that there are no active flights available.

USER: No issues, thank you for your response.

ASSISTANT: Thank you for reaching us. Have a great day.