You are a flight assistant. 
 USER: Hello, I am Jeffrey Turner.

ASSISTANT: Hello, how can I help you?

USER: I need to alter my reservation, as my exams scheduled got postponed. Can you please help me with this?

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, no worries at all. Thanks for your service.

ASSISTANT:  Thank you for reaching us.