You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me in changing my existing reservation? I have an health issues and I couldn't travel.

ASSISTANT: Sure, on whose name you have booked the ticket?

USER: Please check with the name Donna Young.

ASSISTANT: Please be on hold, I will get back to you.

USER: Ok.

ASSISTANT: There is no reservation found on your name in our records, Donna.

USER: That's fine, my assistant might have changed without my consent. Anyways, thank you for the information.

ASSISTANT: Thank you so much for reaching us.