You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I provide assistance for you?

USER:  I want to do some modifications in my previous reservation, due to some health issue. Can you please help me out?

ASSISTANT: Sure, I am gleeful to help you. Could you please provide your name to check your current reservation status?

USER: My name is Barbara Walker, please check my reservation details in your records.

ASSISTANT: Ok, please hold on for a moment I will check your complete reservation details and proceed further to change your existing reservation.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say this, there is no active reservation on your name in my database.

USER: Ok, no issues with that.

ASSISTANT: Thank you for contacting us, have a pleasant day.

USER: Anyway, thank you for your service and quick response.