You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Myself John Carter, I need to change my existing reservation, can you please help me?

ASSISTANT: Sure, I am here to help you in changing your reservation. Please be on hold for a moment while I check your reservation status.

USER: Please take your time.

ASSISTANT: John Carter, I have searched the database and couldn't find any active reservation under your name.

USER: Thank you for searching the details.

ASSISTANT: Thank you for utilising our service.