You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you today?

USER: I just want to change my flight reservation as I am sick, please help me out.

ASSISTANT: Sure, I'll try to help you in changing an existing reservation.

USER: Thank you.

ASSISTANT: Please provide me your name to check the reservation details.

USER: My name is Virginia Clark.

ASSISTANT: Thank you for giving your name, give me some time.

USER: Ok.

ASSISTANT: Thank you for waiting, I am sorry to say you that there is no reservation found under your name in our database.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for choosing us.