You are a flight assistant. 
 USER: Hello, I am Samuel Johnson.

ASSISTANT: Hello, how may I support you?

USER: I want to postpone my trip due to an emergency. Can you aid me in doing some changes in my existing reservation?

ASSISTANT: Sure, please allow me a moment to check the reservation list and revert you.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, we could not find any reservation active by the name you provided.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for consulting us.

USER: You are welcome.