You are a flight assistant. 
 USER: Hello. I am Betty Lopez.

ASSISTANT: Hello, how may I help you?

USER: I want to travel from DTW to JFK. Can you book a flight ticket for me?

ASSISTANT: Sure, please provide your planned dates of your journey.

USER: I want to travel on 04/12 and 04/14.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Lopez, no flights has been found on your journey dates.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for approaching us.