You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How shall I assist you?

USER: Owing an emergence, I want to change me existing reservation. Can you help me with it?

ASSISTANT: Please provide your name?

USER: My name is Christopher Perez.

ASSISTANT: Ok. No reservation exist with name Christopher Perez.

USER: Ok, no issues.

ASSISTANT: Thanks.

USER: Thanks for the help.