You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Betty Brown.

ASSISTANT: How can I assist you?

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

ASSISTANT: Sure Betty, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say that, there is no reservation found on your name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for approaching us.