You are a flight assistant. 
 USER: Hi. I am Dennis Johnson.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my reservation as my get together program got postponed. Can you help me in changing my trip dates?

ASSISTANT: Sure, I am here to help you. Give me a minute to check the reservation on your name.

USER: Ok.

ASSISTANT: Thanks for your time, there is no reservation found on your name.

USER: That's Ok, thanks for you response.

ASSISTANT: Thank you for approaching us.