You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me to change my existing reservation?

ASSISTANT: I will help you with that and please share your name to proceed further.

USER: I am Raymond Perez.

ASSISTANT: Please be on hold for a while.

USER: Ok.

ASSISTANT: Raymond Perez sorry, no reservation found in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.