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

ASSISTANT: Hello, hoe can I serve you 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 am happy to serve you. Can you please wait for few minutes.

USER: Ok.

ASSISTANT: Thank you for your time, there is no existing reservation find on Nicole Baker in our data base.

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

ASSISTANT: Thank you for availing us to change your recent reservation.