You are a flight assistant. 
 USER: Hello, I am Elizabeth Baker.

ASSISTANT: Hello, how can I be your helping hand today?

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

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for being on hold. There is no reservation found on Elizabeth Baker.

USER: Ok, no problem. Thanks for your service.

ASSISTANT: Thank you for availing us, have a good day.