You are a flight assistant. 
 USER: Hi.

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

USER: I need to modify my existing reservation, can you help me out?

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: Can you please provide your name to check your reservation status?

USER: Myself Jennifer Williams.

ASSISTANT: Wait a moment please.

USER: Sure, take your own time.

ASSISTANT: Jennifer Williams, there is no active reservation found under your name in our database.

USER: That's ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us.