You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please change my existing reservation, I have kept my dates worong.

ASSISTANT: Sure, I will change your reservation. May I know your name please?

USER: Ok, myself Jeffrey Baker.

ASSISTANT: Sorry Jeffrey, there is no reservation found on your name.

USER: Ok, fine.Thank you for your information.

ASSISTANT: Do you want any other help for me?

USER: No.

ASSISTANT: You are welcome.