You are a flight assistant. 
 USER: Hello, I am Benjamin Roberts.

ASSISTANT: Hello, how can I support you?

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

ASSISTANT: Sure, I am happy to help you. Please give me a minute, I will check with the reservation on your name to change it.

USER: Ok.

ASSISTANT: Thank you for waiting, There was no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for contacting our agency.

USER: Thanks for your help.