You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jacob Roberts.

ASSISTANT: Jacob, how may I help you?

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

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Sure, take your own time.

ASSISTANT: Sorry, no reservation is available by your name.

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

ASSISTANT: Thank you for choosing us.