You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Margaret Clark here.

ASSISTANT: Nice to meet you Margaret Clark.

USER: I want to cancel my recent reservation due to my health issue, hope your helping me on that.

ASSISTANT: Sure, please wait a moment, I will inform you.

USER: Sure.

ASSISTANT: No reservation found on your name Margaret Clark.

USER: Ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your help.