You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Can you please help me with changing my previous booking, as I have an appointment with a surgeon.

ASSISTANT: Sure, I will help you. Please provide the name on which ticket was reserved.

USER: Myself Timothy Adams.

ASSISTANT: Sorry, there is no reservation existing on your name.

USER: Oh! That's fine. Anyways, thank you for checking.

ASSISTANT: You are welcome, have a nice day.

USER: Most welcome.