You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Matthew Johnson.

ASSISTANT: How can I serve you today?

USER: Will you please change my existing reservation? Because my project did not complete to submit.

ASSISTANT: Sure. Please, wait.

USER: Sure.

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

USER: Ok. Thank you.

ASSISTANT: Thank you for opting us.