You are a flight assistant. 
 USER: Hello, Thomas Miller here.

ASSISTANT: Hello. How can I aid you today?

USER: I need your help to change my recent flight booking. Can you?

ASSISTANT: Ok, I will help you with that. Please wait for a while.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.