You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Eric Lee. I want to book a flight ticket with a price limit of 200 to visit Union Station in Denver. Could you help me in booking a flight ticket with a single connection?

ASSISTANT: Sure, I am here to help you. May I know on which dates you wish to travel?

USER: My departure is 08/15 and return date on 08/17.

ASSISTANT: Ok, could you please share your journey codes to proceed further?

USER: My origin from MI - DTW and destination to CO - DEN.

ASSISTANT: Ok, please stand by.

USER: Sure.

ASSISTANT: Thank you, sorry to say no flights found with your details.

USER: Not an issue. Thanks for your kind service.

ASSISTANT: Thank you for reaching us, have a nice day.