You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: As my exam got postponed, I want to change my existing reservation. Can you help me out?

ASSISTANT: Sure, I am here to help you. Let me check your reservation status in our database.

USER: Sure, my name is Timothy Thompson.

ASSISTANT: Ok.

USER: Please check my details on that name.

ASSISTANT: Thompson sorry to inform that, no reservation is found on your name in our database.

USER: That's ok, thank you.