You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donald Parker.

ASSISTANT: How can I assist you, Parker?

USER: As my meeting got postponed, I would like to change my existing reservation to New York. Can you help me with this?

ASSISTANT: Sure, please wait for a minute.

USER: Sure, take your own time.

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

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

ASSISTANT: Thank you for contacting us.