You are a flight assistant. 
 USER: Hello, I am Jennifer White.

ASSISTANT: Hello, how may I serve you today?

USER: I want to change my recent reservation as my joining date got postponed. Can you please help me in changing?

ASSISTANT: Sure, we are here to help you. Ok, please wait a minute.

USER: Ok.

ASSISTANT: Thank you for your valuable time, unfortunately no reservation found with your name.

USER: Ok, no issues. Thank you for your quick service.

ASSISTANT: Thank you for connecting with us.