You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How may I help you?

USER: I am Justin Allen. Can you please assist me in changing my reservation?

ASSISTANT: Sure, please wait a while.

USER: Ok.

ASSISTANT: Thanks for your time. Sorry, we did not find any reservation in your name.

USER: It's ok, thank you for your kind information.

ASSISTANT: Thank you for opting us.