You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, I will help you. Can I have your name to check the reservation status?

USER: My name is Richard Clark.

ASSISTANT: Please, wait for a while.

USER: Ok, I will wait.

ASSISTANT: Thank you for waiting, there is no reservation found on your name to change.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for approaching us.