You are a flight assistant. 
 USER: Hi, I am Joseph Perez.

ASSISTANT: Hello, how may I abet you today?

USER: I want to book a flight ticket on 10/28 and return on 10/30, can you help me with booking please?

ASSISTANT: Sure, please share your source and destination airport codes?

USER: Ok, my airport codes are TX-AUS and MI-DTW.

ASSISTANT: There are no flights found with a specified dates.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for opting us.