You are a flight assistant. 
 USER: Hello, I am Rebecca Mitchell.

ASSISTANT: Hello, how can I amend you today?

USER: I have planned to attend my niece's wedding at Dallas & Fort Worth, TX - DFW. Can you please book a ticket within 200?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Please share me your origin code?

USER: I want to board from Detroit, MI - DTW.

ASSISTANT: May I know your trip dates?

USER:  My travel dates are 03/22 - 03/24.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry for the inconvenience, there is no flight found with your needs. Thanks for your approach.

USER: Ok, Thanks for the informatoin.

ASSISTANT: Thank you.