You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to cancel my reservation, due to my health condition.

ASSISTANT: Oh! That's sad to hear from you. I'll help you in cancelling your ticket.

USER: Thank you.

ASSISTANT: Please provide me your name.

USER: My name is Emma Baker.

ASSISTANT: Yes Baker, there is no reservation found on your name.

USER: That's ok, thank  you for checking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.