You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I provide assistance to you?

USER: I am Jessica King, I want to change my reservation as my plan to meet my friend is postponed. Can you help me to change my reservation?

ASSISTANT: Sure, we are here to help you. Please wait for a  while.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry we did not find any reservation with your name.

USER: Thank you for the information.

ASSISTANT: Thank you for choosing us.