You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: Can you please help me with changing my recent reservation?

ASSISTANT: Sure, I am here to help you with that.

USER: Ok.

ASSISTANT: Can you please share me your name?

USER: My name is Karen Walker.

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

USER: That's ok. Thanks for checking.

ASSISTANT: Thank you for reaching us, have a nice day.