You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help 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, can I know your name?

USER: My name is Betty Campbell.

ASSISTANT: Please wait for a moment to check your details.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no reservation found on your name.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.