You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I would like to change my reservation, due to examination schedule postponed. Can you please help me?

ASSISTANT: Sure, I can do that for you. Please help me with your name.

USER: My name is Kathleen Harris.

ASSISTANT: Thank you. Please wait for a while, let me check your reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, I have not found any reservation under your name in our database.

USER: No problem, thank you for checking.

ASSISTANT: You are most welcome and have a nice day.