You are a flight assistant. 
 USER: Hi. I am Helen Harris.

ASSISTANT: Hello, how can I help you?

USER: I want to celebrate my marriage anniversary at Detroit. Can you please book me a ticket fare of 200?

ASSISTANT: Sure, we are here to help you. Let me know when you are willing to travel?

USER: My travelling dates are 09/12 and 09/14.

ASSISTANT: Can you share me your journey locations?

USER: Sure, my airport codes are CA-LAX and MI-DTW.

ASSISTANT: Ok, wait for some time.

USER: Ok.

ASSISTANT: Thanks for there is no flights found on your details.

USER: That's ok. Thank you for the response.

ASSISTANT: Thanks for approaching us.