You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I oblige you today?

USER: I want to change my existing reservation the name of Gary Garcia. Can you help me in this?

ASSISTANT: Sure, we will help you.

USER: Thank you.

ASSISTANT: Please, wait for a while.

USER: Ok.

ASSISTANT: Thanks for your time. There is no reservation found on your name.

USER: It's ok, not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for you information.