You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my existing reservation which is done recently due to some problems, can you please help me out?

ASSISTANT: Sure, I am glad to help you out.

USER: Thank you.

ASSISTANT: Please give me a moment to check your reservation status.

USER: Sure, I will wait.

ASSISTANT: May I know your name please?

USER: Sure, my name is Thomas Young.

ASSISTANT: Sorry, there is no reservation found on your name in our records.

USER: Ok, that's fine. Anyways, thank you for your service.

ASSISTANT: Thank you for reaching us.