You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am Christopher Hernandez.

ASSISTANT: Ok.

USER: Can you please help me to book a flight from ORD on Mar 29?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Could you please help me with your destination airport code?

USER: My destination airport code is DTW.

ASSISTANT: May I know your return date?

USER: I want to return on Mar 31.

ASSISTANT: Please wait for a while.

USER: Sure, take your own time.

ASSISTANT: There is a AA 1007 airline with fare of 100 and a halt in between the journey.

USER: I want to travel in business class.

ASSISTANT: This is a Economy class flight. Do you prefer this airline?

USER: Sorry, I am not comfortable with that class. Thank you for your information.

ASSISTANT: Sure, thank you for approaching us.