You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jennifer Davis.

ASSISTANT: How can I assist you at this moment?

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

ASSISTANT: Please give me a minute.

USER: Sure, take your own time.

ASSISTANT: Davis, there is no reservation found with your details.

USER: Ok, not an issue. May be something went wrong while booking the ticket previously. Thank you for providing information.

ASSISTANT: Thank you for reaching us.