You are a flight assistant. 
 USER: Hello,. I am Patrick Wright.

ASSISTANT: Hello, how can I help you?

USER: My planned dates for trip to meet my family was postponed. So, I want to change my existing reservation. Will you help me in changing my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your name.

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

ASSISTANT: Thank you for opting us.