You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to change my recent reservation, can you help me in doing that?

ASSISTANT: Sure, may I know your name?

USER: Samuel Garcia here.

ASSISTANT: Sorry, we could not found any reservation on your name.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you.