You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Catherine Baker here.

ASSISTANT: How can I assist you?

USER: Due to some personal work I want to change my recent reservation, can you help me?

ASSISTANT: Sure Baker, please wait a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry to say that, there is no reservation found on your name.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for approaching us.