You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Just a moment please.

USER: Sure, my name is Cynthia Jackson. I will wait for your response.

ASSISTANT: May I know your name please?

USER: I have already provided.

ASSISTANT: I am sorry no reservation found on your name.

USER: Ok, thanks for your response.

ASSISTANT: Thank you for choosing us.