You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am John King.

ASSISTANT: King, how may I assist you today?

USER: Can you help me to change my reservation to next week?

ASSISTANT: Sure, I will help you to change your reservation, please hold on for a moment to check your reservation status.

USER: Sure, please check.

ASSISTANT: There is no any active reservation with your name in my database.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: It's my pleasure, have a nice day.