You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Edward Martinez.

ASSISTANT: How may I aid you today?

USER: I have planned to go for a tour with my colleagues, but I met with an accident. Please change my existing reservation.

ASSISTANT: Sure, I am here to help you. Please give me a minute.

USER: Ok.

ASSISTANT: Thanks for being patient, there is no reservation found on your name to change.

USER: No issues, thanks for the response.

ASSISTANT: Thank you for availing us, hope to serve you again.