You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Actually my Hockey national competition is postponed so that I want change an existing reservation, can you help me?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Sure, the previous reservation is done under the name of Anthony Thomas.

ASSISTANT: Ok, please allow me a moment while I check for the previous reservation.

USER: Ok, take your own time.

ASSISTANT: Your patience is greatly appreciated. Anthony, there is no reservation found under your name.

USER: Ok, no problem. Anyway's thank you for your information.

ASSISTANT: You are welcome. Thank you for contacting us.