You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no active reservation found in your name.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing us.