You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: Can you please help me in changing my recent reservation?

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

USER: Sure, My name is Angela Collins.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: Ok, No issues. Thank you.

ASSISTANT: You are welcome, have a nice day.