You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Kimberly Perez.

ASSISTANT: Nice to meet you Perez.

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: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: I cannot find any reservation with your name. Do you want to know any thing else from us?

USER: No thanks, anyway thank you for your help.

ASSISTANT: It's my pleasure.