You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I aid you?

USER: I made a reservation earlier in the wrong date unknowingly. So, I want to change my existing reservation. My name is David Phillips.

ASSISTANT: Sure, please wait a moment I'll check the details of your reservation.

USER: Sure.

ASSISTANT: Sorry David, in my database I didn't found any details regarding your reservation.

USER: That's ok, not an issue.

ASSISTANT: Thanks for connecting with us. Have a good day.

USER: Thanks for your kind response.