You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Steven Turner here. I was made a reservation earlier in this week. But I want to change the reservation. Can you please help me for that?

ASSISTANT: Ok, please wait.

USER: Ok, I will wait.

ASSISTANT: Thanks for waiting and sorry, no reservation found on your name.

USER: Thanks for the information.

ASSISTANT: Most welcome.