You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I want to change my existing reservation due to some technical issues. Can you help me with that?

ASSISTANT: Sure. May I know your name?

USER: I am Brenda Baker.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.