You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: Due to sudden work at my office, I am unable to travel now, Can you please change my reservation?

ASSISTANT: Sure, will you please let me know your name to check the database and revert you?

USER: Sure, I am Gregory Martinez.

ASSISTANT: Ok, please wait.

USER: Ok, I will wait.

ASSISTANT: Thanks for waiting Gregory Martinez, we could not find any reservation by your name.

USER: Ok, Thank you.

ASSISTANT: Thank you for approaching us.