You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Raymond White here. I want to change my reservation, can you help me please?

ASSISTANT: Sure, give me a minute.

USER: Ok, take your own time.

ASSISTANT: Sorry, there is no reservation found under your name. Thank you for choosing us.

USER: Oh! That's fine. I will find any alternative for my journey. Most welcome.