You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Stephen Taylor here.

ASSISTANT: Taylor, how may I help you?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Ok, I will wait.

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

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.