You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Cynthia Walker, I want to change my round trip trip journey. Ca you help me to change my reservation due to my bad health?

ASSISTANT: Sure. Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for choosing us.