You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Owing to an emergency I want to cancel my reservation, can you help me?

ASSISTANT: Sure, may I know your name?

USER: Myself Helen Harris.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry Helen, I have not found any reservation under your name in our database.

USER: No problem, thanks for checking.

ASSISTANT: You are welcome and thank you for choosing us.