You are a flight assistant. 
 USER: Hi, I am Jennifer Nelson.

ASSISTANT: Hello. How can I serve you?

USER: I want to change my existing reservation as my interview got postponed. Please help me out.

ASSISTANT: Sure. Please wait.

USER: Thank you. Ok.

ASSISTANT: Thanks for waiting. There is no reservation on your name.

USER: That's fine, thank you for the response.

ASSISTANT: Thanks for choosing us.