You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Jessica Wilson. Due to my health problem I want to change my reservation, can you please help me to change my reservation?

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT:  Sorry to say that no reservation was found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.