You are a flight assistant. 
 USER: Hello, myself Justin Roberts.

ASSISTANT: Hello, How may I aid you today?

USER: I want to change an existing reservation. As I could not finish my work in time as per schedule. Can you please help me with this?

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

USER: Sure.

ASSISTANT: Thanks for waiting. We do not find any reservation with your name.

USER: Thank you for being my helping hand.

ASSISTANT: Thank you for contacting us.