You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Benjamin Walker.

ASSISTANT: How may I help you today?

USER: Can you help me for cancelling my recent reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Ok, I will wait for your reply.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: Oh! I think my sister already cancelled my reservation, anyway thank you for your services.

ASSISTANT: Thank you for reaching us.