You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Brian Smith here. I want to book a flight ticket to New York, to submit my research record at New York university. Can you please help me?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Ok, my planned dates of journey are from 01/23 to 01/25.

ASSISTANT: Please share me your source and destination codes.

USER: Ok, my respective airports codes are DTW and LGA.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a return time which should be at evening.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, that's fine.

ASSISTANT: Thank you for reaching us.

USER: Anyways, thank you for your service.