You are a flight assistant. 
 USER: Hi. I am Jeffrey Perez.

ASSISTANT: Hello. How may I help you?

USER: I want to change my reservation as my project got ramp down and need time to complete it. Can you help me in changing?

ASSISTANT: Sure, I will help you. Please, wait a minute.

USER: Ok, take your own time.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Ok fine, Thanks for your response.

ASSISTANT: Thank you.