You are a flight assistant. 
 USER: Hello, I am Brandon Davis.

ASSISTANT: Hello, how can I assist you?

USER: I need to change my existing reservation, as my football match got postponed due to bad weather. Please help me in changing?

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for choosing us.