You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nancy Moore.

ASSISTANT: How may I help you?

USER: I would like to change my existing reservation to Oakland due to my ill health. Will you help me with this?

ASSISTANT: Nancy, I am willing to help you. Let me check your reservation status in our records.

USER: Sure, take your own time.

ASSISTANT: Nancy sorry for inconvenience, no reservation is available with your criteria.

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

ASSISTANT: Thank you Nancy for utilizing our agency.