You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I abet you today?

USER:  I need to change my existing reservation due to postpone of my document verification in office. Can you help me out?

ASSISTANT: Sure, we are here to help you.

USER: Ok.

ASSISTANT: Let me know your name for further process.

USER: My name is Carol Jackson.

ASSISTANT: There is no reservation found with your name.

USER: Not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for kind information.