You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I assist you?

USER: Please help me in changing my existing reservation, as my FIFA match got postponed.

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

USER: Thank you.

ASSISTANT: Can I have your name please?

USER: My name is Jacob Campbell.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Jacob Campbell, we haven't found any reservation under your name in our database.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.