You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, please wait for a  while.

USER: Ok. Not a problem.

ASSISTANT: Sure, may I know your name?

USER: Jonathan Hernandez.

ASSISTANT: Sorry, there is no reservation with your name to change further.

USER: That's Fine. Thank you.

ASSISTANT: Thank you.