You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Charles Young. I want to change my existing reservation due to board exams. Can you help me in this?

ASSISTANT: Sure, we are here to help you. Wait for some time I will check the reservations on your name and get back to you.

USER: Ok.

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

USER: That's fine, thank you for your service.

ASSISTANT: Thanks for approaching us.