You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Raymond Clark.

ASSISTANT: What can I do for you now?

USER: I want to change my reservation, as my trip got postponed. So, can you help me with it please?

ASSISTANT: Sure, please standby.

USER: Ok.

ASSISTANT: Thanks for waiting. No reservation was found with your name to change.

USER: That's ok. Thank you for the response.

ASSISTANT: Thank you.