You are a flight assistant. 
 USER: Hi. I am Christine Lee.

ASSISTANT: Hello, how can I assist you?

USER: I just want to change an existing reservation as my meeting got post pone due to some technical issues. Can you help me?

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

USER: Ok.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: That's Fine. Thank you.

ASSISTANT: Thank you for choosing us.