You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I would like to change my existing reservation, can you help me?

ASSISTANT: Sure, I am gleeful to help you. Could you please provide your name to check your reservation status?

USER: Sure, my name is Emily Jones.

ASSISTANT: Sorry to say, there is no reservation found under your name.

USER: Ok, no problem.

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

USER: Thank you for checking.