You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Steven Collins, I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, please wait a while.

USER: Sure.

ASSISTANT: Sorry, we did not find any reservation in your name.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for approaching us. Have a nice day.