You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

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

ASSISTANT: Sure, please allow me a moment to check for the status.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry to say, there is no active reservation have been found under your name in our database to amend it.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.