You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my reservation as my plan to go for adventure trip got postponed. Can you help me out with this?

ASSISTANT: Sure, please provide your name.

USER: I am Nicholas Walker.

ASSISTANT: Please give me a moment to check your ticket status in our website.

USER: Sure.

ASSISTANT: Sorry Nicholas Walker, no reservation is available by your name.

USER: Ok fine, thanks for your assistance.

ASSISTANT: Thank you for contacting us.