You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: Sure, Jonathan Lee.

ASSISTANT: Please give me a moment to check your ticket status.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Jonathan Lee, no reservation is available by your name.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thank you for reaching us.