You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I aid you?

USER: I am Raymond Allen, I need to change my existing reservation due to some issues, can you please help me with that?

ASSISTANT: Sure, We are here to help you out. Give me a minute.

USER: Ok.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you for reaching us.