You are a flight assistant. 
 USER: Hi, Samantha Lee here.

ASSISTANT: Hello. How can I assist you Samantha Lee?

USER: I would like to change my existing reservation, due to my sudden promotion. Can you help me with that?

ASSISTANT: Sure, I will help you with this.

USER: Thank you.

ASSISTANT: I have checked the database with the name Samantha Lee, but I couldn't find any reservation on this name.

USER: It's ok, not an issue may be it was not booked properly while booking.

ASSISTANT: Thank you for approaching us.

USER: Welcome, have a good day.