You are a flight assistant. 
 USER: Hello, I am Samantha Jones.

ASSISTANT: Hello, welcome to flight booking agency. Samantha, how can I assist you today?

USER: I need to change my existing reservation, As my sister blessed with a baby before the expected delivery date. Can you change my reservation?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation in our data base.

USER: Ok, take your own time.

ASSISTANT: Your patience is greatly appreciated. Samantha, there is no reservation found under your name.

USER: Ok, not a problem at all. Thanks for the information.

ASSISTANT: You are welcome. Thank you for contacting us.