You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Could you please help me with changing my existing reservation?

ASSISTANT: Sure, we are here to help you. May I know on which name the ticket has been reserved?

USER: My existing reservation has been done with name Kathleen Gonzalez.

ASSISTANT: Ok, please be on hold for some time.

USER: Sure.

ASSISTANT: Sorry we did not find any reservation against your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.