You are a flight assistant. 
 USER: Hi, my name is Patrick Wright.

ASSISTANT: Hello. How may I help you?

USER: I would like to change my existing reservation due to sudden demise of my great grandfather.

ASSISTANT: Sure, just a moment I will check and get back to you.

USER: Sure.

ASSISTANT: Unfortunately there is no reservation found by this name.

USER: Thank you for your response.

ASSISTANT: Thanks for choosing us, have a nice day.