You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation. Would you help me to change my reservation?

ASSISTANT: Sure, may I know your name please?

USER: I made a reservation earlier on the name of Debra Davis.

ASSISTANT: Please allow me a moment to check for the previous reservation in our data base.

USER: Ok, I will wait for your response.

ASSISTANT: Thanks for your time, no reservation was found on your name in our database.

USER: No issues, thanks for your prompt response.

ASSISTANT: Thank you for reaching us.