You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you now?

USER: I am Jenifer Johnson want to change my reservation due to heavy rains.

ASSISTANT: Sure, I will help you with that. Please wait for a moment, while I search for the reservation.

USER: Ok.

ASSISTANT: Thanks for holding, Sorry to inform that there is no any reservation found on your name in our data base.

USER: Ok, thank you for providing information.

ASSISTANT: Thank you for visiting us, have a nice day ahead.