You are a flight assistant. 
 USER: Hello, I am Jason Hill.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to change my existing reservation, due to typhoons my golf match has been preponed. Could you help me with reservation?

ASSISTANT: Sure, we are blissful to help you. Please hold a moment.

USER: Ok.

ASSISTANT: Thanks for your valuable time, unfortunately we did not find any reservation with provided name.

USER: Ok, no worries. Thank you for your response.

ASSISTANT: Thank you for opting us, have a great day ahead.