You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you today?

USER: Due to some technical issues, my project submission is postponed. Can you help me change my existing reservation with the name of Gary Mitchell?

ASSISTANT: Sure, I will help you with that, please wait for a moment.

USER: Ok.

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

USER: Ok, thank you for your response.

ASSISTANT: Thank you for picking us, have a nice day.