You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

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

ASSISTANT: Sure, may I know the name to check for the status?

USER: My name is Robert Davis.

ASSISTANT: Please be on hold, I will get back to you in a minute.

USER: Ok.

ASSISTANT: Thank you for waiting.

USER: My pleasure.

ASSISTANT: Here, there is no active reservation have been found under your name in our database to amend it.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.