You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I want to change my existing reservation which is done recently due to some health issues, can you please help me in this?

ASSISTANT: May I know your name, please?

USER: Sure, my name is Susan Thompson.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry, there are no active reservations on your given name to change.

USER: Ok, not an issue. Anyways, thank you for your service.

ASSISTANT: Thank you for reaching our service.