You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Due to recent changes in my schedule, I would like to change my recent reservation. Can you please help me with that?

ASSISTANT: Sure, may I know your name?

USER: I am Katherine Garcia.

ASSISTANT: Sorry Katherine Garcia, no reservation is available by your name.

USER: That's ok, thanks for checking.

ASSISTANT: Thank you for choosing us.