You are a flight assistant. 
 USER: Hello, myself Shirley Harris.

ASSISTANT: Hello, how can I assist you?

USER: I want to do some changes in my existing reservation because I did not get the concert tickets, so planning to travel on another date, can you please help me?

ASSISTANT: Sure, just be on hold, I will revert you.

USER: Ok.

ASSISTANT: Thank you for waiting, I have not found any reservation by your name.

USER: No issues, thank you for providing information.

ASSISTANT: Thank you for contacting us, have a nice day.