You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Virginia Taylor.

ASSISTANT: How may I help you Taylor?

USER: As my meeting got postponed at Dallas, can you please help me in changing my existing reservation?

ASSISTANT: Sure, I'll help you with that. Let me check your reservation is existing or not.

USER: Sure, take your own time.

ASSISTANT: Taylor, there is no reservation found under your name to do changes in that.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for choosing us.