You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Donald Hernandez. I need to book a flight ticket to Detroit, MI - DTW to celebrate the folk festival with my colleagues.

ASSISTANT: Sure, when are you planning to travel?

USER: I am planning to travel on 04/14 and return on 04/16.

ASSISTANT: Please provide your origin airport code.

USER: My origin is San Francisco, CA - SFO.

ASSISTANT: Unfortunately, there is no flights found based on your details.

USER: No issues, thanks for your service.

ASSISTANT: Thank you for choosing us.