You are a flight assistant. 
 USER: Hi. I am Jack Adams.

ASSISTANT: Hello, how may I help you today?

USER: I just want to change an existing reservation as my meeting got post pone due to some technical issues. Can you please help me with this?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name.

USER: No issues. Thank you for your information.

ASSISTANT: Thank you for opting us.