You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: My final examinations are postponed, so I need to change my recent reservation. Can you help me in altering my ticket?

ASSISTANT: Sure, I will help you with that. May I know your good name for checking existing reservation status?

USER: My name is Christine Smith.

ASSISTANT: Ok, please wait a moment. Thank you for waiting. Sorry Smith, there is no reservataion found under your name.

USER: It's ok, thank you for searching.

ASSISTANT: My pleasure. Thank you for reaching us.