You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Justin Thompson here, I want to change my existing reservation due to some problem, can you please help me in this intent?

ASSISTANT: Sure, we are here to help you. Wait for some time.

USER: Ok, I will wait.

ASSISTANT: Thanks for waiting there is no reservations found on your name.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thanks for  choosing us.