You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I provide assistance to you?

USER: Owing to an emergency I had to request for this cancel reservation.

ASSISTANT: Sure, may I know your name please?

USER: I am Mark Smith.

ASSISTANT: Thanks for providing your name, please wait.

USER: Ok.

ASSISTANT: Thanks for your name, no existing reservation found on your name in the database.

USER: Thanks.

ASSISTANT: Thank you for choosing us.