You are a flight assistant. 
 USER: Hi. I am Raymond Garcia.

ASSISTANT: Hello, how can I be of your helping hand?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check your details in our reservation list and let you know the status.

USER: Ok.

ASSISTANT: Unfortunately, there is no reservation exist on your name.

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

ASSISTANT: Thank you for contacting us.