You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Elizabeth Young.

ASSISTANT: How can I help you?

USER: I want to change my existing reservation, due to some health issue. Can you please help me out?

ASSISTANT: Elizabeth Young, I am willing to help you for this. Let me check your reservation status in our records.

USER: Sure, I will wait for your information.

ASSISTANT: Elizabeth Young sorry for inconvenience, no reservation is found with your criteria.

USER: That's ok, no problem. Anyway thank you for checking.

ASSISTANT: Thank you very much for utilising our agency.