You are a flight assistant. 
 USER: Hello. Raymond Gonzalez here.

ASSISTANT: Hello, how can I help you?

USER: I am planning to change my existing reservation details, can you please help me out?

ASSISTANT: Sure, I am here to help you. Please wait a minute.

USER: Ok, take your time.

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

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.