You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: I am Patrick Garcia. I want to change my existing reservation, my sports event has been postponed. Could you please help me with changing?

ASSISTANT: Sure, we are here to help you to change your reservation. Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your name.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for choosing us.