You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to change my existing reservation, can you help me in changing my reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thanks.

ASSISTANT: May I know your name please?

USER: Linda Thompson is my name.

ASSISTANT: Ok, wait a minute please.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform no reservation found on your name.

USER: Ok, no problem with that.

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

USER: Thanks for the response.