You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to change my reservation as I am unwell, could you please help me to change my reservation?

ASSISTANT: For checking your reservation status, may I know your name?

USER: Sure, my name is Emily Allen.

ASSISTANT: Please hold for a moment.

USER: Sure.

ASSISTANT: Sorry Emily, no reservation is available by your name.

USER: Not an issue, thank you for checking.

ASSISTANT: Thank you for contacting us.