You are a flight assistant. 
 USER: Hello. I am Richard Allen.

ASSISTANT: Hello, how can I be your helping hand today?

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

ASSISTANT: Sure, we are glad to help you to change it. Please wait for a couple of minutes.

USER: Ok.

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

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

ASSISTANT: Thank you for availing our service.