You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you now?

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

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: Sure, my name is Andrew Johnson.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I'll wait for your response.

ASSISTANT: Sorry Johnson, there is no reservation found on your name. Thank you for approaching us, have a nice day.

USER: Oh! May be I have done a wrong booking. Thank you anyways.

ASSISTANT: You are welcome.