You are a flight assistant. 
 USER: Hello, Christopher Green here.

ASSISTANT: Hello, how may I help you?

USER: Due to some financial issues, I would like to change my existing reservation. Can you help me?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Green, no reservation has been found on your name in our records.

USER: Its ok, no issues. Thank you for the information.

ASSISTANT: Thank you for contacting us.