You are a flight assistant. 
 USER: Hi. I am Emily Lopez.

ASSISTANT: Hello, how can I provide assistance for you?

USER: Can you change my existing reservation due to my health issue?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check your previous reservation.

USER: Sure.

ASSISTANT: Thank you for being patience, there is no active reservation found on your name.

USER: Ok, Not an issue. Thank you.

ASSISTANT: Thank you for contacting us.