You are a flight assistant. 
 USER: Hello, I am Ruth Johnson.

ASSISTANT: Hello, how can I support you?

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

ASSISTANT: Sure, I am happy to help you. Please wait for a while.

USER: Ok.

ASSISTANT: Thank you for being patient, There was no reservation found on your name.

USER: Ok, no problem. Thanks for your response.

ASSISTANT: Thank you for availing us.