You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Samuel Gonzalez. Can you please help me in changing my existing reservation, as my football match got postponed to some other date.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, there was no reservation found with your given name.

USER: No problem, thanks for your information.

ASSISTANT: Thank you.