You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I serve you today?

USER:  I am Nichole Garcia. Due to wrong source code is mentioned in my previous reservation. So, I want to change my existing reservation. Can you help me out in changing my reservation?

ASSISTANT: Sure, I will help you. Wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting. I regret to inform you that there is no reservation found with your name.

USER: Ok, not a problem. Thanks for your quick service.

ASSISTANT: Ok, Thanks for contacting us.