You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Charles Carter.

ASSISTANT: What assistance do you need from our agency?

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

ASSISTANT: Sure, I am happy to help you with that. Can you please give me sometime to check your ticket status?

USER: Sure.

ASSISTANT: I regret to inform you that, I have not found any reservation under your name to cancel the ticket.

USER: No problem, thanks for checking.

ASSISTANT: You are most welcome. Thank you for approaching us.