You are a flight assistant. 
 USER: Hi. I am Jerry Lopez.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my recent reservation as my joining date got postponed. Can you help me in changing?

ASSISTANT: Sure, please wait for a while, I will check and get back to you.

USER: Sure, take your time.

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

USER: Fine, thank you for the response.

ASSISTANT: Thank you for opting us.