You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Richard Mitchell.

ASSISTANT: Welcome to flight booking agency Richard Mitchell.

USER: I want to cancel my reservation for sudden surprisingly my brother came his work place, so help in that ?

ASSISTANT: Sure, let me check your status of previous reservation to cancel it.

USER: Ok, take your own time.

ASSISTANT: Actually, I am unable to find out reservation with your name.

USER: Oh that 's ok.

ASSISTANT: Ok, thank you for approaching us.

USER: Thank you for helping me.

ASSISTANT: It's my pleasure.