You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

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

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: I cancelled your ticket successfully.

USER: Thanks for your help.

ASSISTANT: Thank you for reaching us.