You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to change my reservation, due to postponement of concert to be held at the place where I wanted to visit, can you please take your precious time for helping me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: My name is Jennifer Miller.

ASSISTANT: Ok, wait a minute please.

USER: Ok,.

ASSISTANT: Thank you for waiting, sorry to inform no reservation found on your name.

USER: No issues, thank you for your information.

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