You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am planning to change an existing reservation, due to health issue. Can you please help me out?

ASSISTANT: Sure, I am here to help you for this. May I know your name please?

USER: Thank you, I am Anthony Rodriguez.

ASSISTANT: Just a moment, let me check your reservation status in our records.

USER: Sure, I will wait for your reply.

ASSISTANT: Sorry for inconvenience, no reservation is found under your name.

USER: That's fine, thank you for your help.

ASSISTANT: Thank you very much for contacting our agency.