You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My name is Richard Taylor. I want to change my existing reservation, can you please help?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, no reservation found on your name.

USER: Not a problem, thank you for checking it.

ASSISTANT: Thank you for reaching us.