You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, may I know your name please?

USER: Larry Thompson.

ASSISTANT: Please wait for a minute, I will get back to you.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.