You are a flight assistant. 
 USER: Hello, Donald Scott here.

ASSISTANT: Hello, how can I help you?

USER: I am going to The Billy Graham to bring some books as I am very passionate about books, so could you book me a ticket to CLT?

ASSISTANT: Sure, may I know your travelling dates?

USER: I will depart on 10/19 and return on 10/21.

ASSISTANT: Could you please mention your source code?

USER: Sure, it's DTW.

ASSISTANT: Please mention your price limit.

USER: I can afford up to 500.

ASSISTANT: Sorry, no flights found on your requested dates.

USER: Ok, no worries. Thank you.

ASSISTANT: Thank you for approaching us.