You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Due to some important client meeting, I am planning to change my reservation. Can you please help me for this?

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: Myself Catherine Johnson.

ASSISTANT: Please give me a moment to check your ticket status.

USER: Sure.

ASSISTANT: Sorry Catherine Johnson, no reservation is available by your name.

USER: Not a big problem, anyhow thank you very much for your kind information.

ASSISTANT: Thank you for reaching us.