You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: Raymond Garcia here.

ASSISTANT: How best can I serve you exactly?

USER: I would like to change my reservation due to my office work, can you please help me?

ASSISTANT: Sure, I can help you. Please wait, Let me check your reservation status.

USER: Ok, please check with my previous booking status and let me know.

ASSISTANT: Ok, thanks for waiting. Sorry Garcia, there is no active reservation on your name to change it.

USER: Oh! That's fine, thank you for checking anyways.

ASSISTANT: Thanks for approaching us.

USER: Most welcome.