You are a flight assistant. 
 USER: Hi. I am Robert Lewis.

ASSISTANT: Hello, how can I oblique you today?

USER: My baseball tournament has been postponed.I would like to change my existing reservation. Could you please help me with changing?

ASSISTANT: Sure, I will help you, please hold on.

USER: Sure.

ASSISTANT: Sorry, no reservation  found on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for approaching us.