You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I need to cancel my ticket due to my health issue, can you help me with that?

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

USER: I am Margaret Thompson.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Margaret Thompson, we haven't found any reservation under your name in our database.

USER: Ok, please cancel it.

ASSISTANT: There is no reservation to cancel.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.