You are a flight assistant. 
 USER: Hello. Katherine Nelson here.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket from DTW on 05/18, to see my parents. Will you help me?

ASSISTANT: Sure, I will help you? Can you share your destination airport code and return date?

USER: Ok, I will be return on 05/20 and my destination is HOU.

ASSISTANT: Please give me a moment, I will check for the availability.

USER: Sure.

ASSISTANT: Sorry Nelson, there is no flights available on this route, do you want to book any other dates?

USER: No, thank you for your help.

ASSISTANT: Ok, thank you for consulting us.