You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, I will help you to change your reservation. May I know on which name the reservation was made?

USER: Check the reservation under the name of Michelle Baker.

ASSISTANT: Please wait for a moment and let me search for the reservation on your name.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry Michelle Baker, there is no reservation found on your name in our system data base.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for visiting us, we hope see you again.