You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am David Davis.

ASSISTANT: How may I guide you today?

USER: Owing to an urgency, I would like to cancel my recent reservation. Will you help me with this?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure, I will wait for your response.

ASSISTANT:  David Davis, I am sorry to say that there is no reservation found under your name.

USER: Ok, not an issue. May be my brother has already cancelled my reservation on behalf of me.

ASSISTANT: Thank you for contacting us, have a great day.

USER: Thank you for providing information.