You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation due to my health issues, can you please help me with this?

ASSISTANT: Sure, may I know your name?

USER: \My name is Donald Miller.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: Not an issue, thank you for checking.

ASSISTANT: Thank you for choosing us.