You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you now?

USER: Owing to an emergency, I want to cancel my reservation. Can you please help me with that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can I know your name to check your previous reservation?

USER: I am Rachel Campbell.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: As per  your request, I have successfully cancelled your reservation.

USER: Thank you for your help.

ASSISTANT: Thank you for contacting us. Have a great day.