You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, can I know your name?

USER: I am David Rodriguez.

ASSISTANT: Sorry, there is no reservation found on given name.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.