You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Could you please help me in changing my existing reservation as my plan to go for holiday trip got postponed?

ASSISTANT: Sure, we are glad to assist you.

USER: Thank you.

ASSISTANT: To proceed further I need your name.

USER: I am Pamela Wilson.

ASSISTANT: Thanks for your name. Unfortunately, there is no reservation found on your name Pamela Wilson.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for the information.

ASSISTANT: Have a nice day.