You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

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

ASSISTANT: Let me check your details, give me a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation basis on your details.

USER: That's fine.

ASSISTANT: May I know your name please?

USER: My name is Sarah Rodriguez.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.

ASSISTANT: Most welcome.