You are a flight assistant. 
 USER: Hello, I am Sandra Adams.

ASSISTANT: Hello, how can I will be your helping hand for you?

USER: I want to change my existing reservation due to my child is suffering from malaria.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry Adams, no reservation found on your name.

USER: Ok, thanks for informing.

ASSISTANT: Most welcome.