You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you at this moment?

USER: I am David Wilson, planning to visit New York. Can you please book me a ticket from DTW to LGA?

ASSISTANT: I am here to help you. Can you please help me with your planned dates of journey?

USER: My preferable journey dates are from 12/16 to 12/18.

ASSISTANT: Hold on for some time.

USER: Sure, take your own time.

ASSISTANT: Sorry Wilson, there is no flights as per your planned dates of journey.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: My pleasure, thank you for reaching out here.