You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you today?

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

ASSISTANT: Ok, could I know that on which name reservation had been done?

USER: I have reserved flight ticket on the name of Cynthia Jackson.

ASSISTANT: Please hold on a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, that's not an issues. Thank you so much for your time.

ASSISTANT: Thank you for connecting with us.