You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: Can you please change my existing reservation? As my football match dates has been postponed due to bad weather conditions.

ASSISTANT: Sure, May I know your name?

USER: Thank you. I am James Thomas.

ASSISTANT: Please wait a second.

USER: Sure, I will wait.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, no problem. Thank you for your quick response.

ASSISTANT: Thank you for opting us.