You are a flight assistant. 
 USER: Hello. I am John Brown.

ASSISTANT: Hello, how can I help you?

USER: Can you help me with changing my reservation to new travelling dates?

ASSISTANT: Sure, please wait for a moment.

USER: Ok, take your time to get my reservation status.

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

USER: It's ok, thanks for checking my reservation status.

ASSISTANT: Thank you for opting us.