You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

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

ASSISTANT: Sure, may I know your name?

USER: Sure, I am Betty Smith.

ASSISTANT: Please wait for a minute.

USER: Ok, I will wait.

ASSISTANT: There is no reservation found with your name in our database.

USER: Ok, Thank you for your service.

ASSISTANT: Thanks for approaching us.