You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: Due to health issues, I want to change my existing reservation. Can you help me with it?

ASSISTANT: Sure, we can change your reservation right now before that I need to know your good name?

USER: My name is Pamela Davis.

ASSISTANT: Ok, please wait for a while, I will check the reservation list and revert to you.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thanks for connecting us and have great day.