You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joseph Brown.

ASSISTANT: How may I assist you?

USER: Owing to an emergency, I want to cancel my recent reservation. Can you help me out?

ASSISTANT: Sure, I can help you in cancellation process.

USER: Ok.

ASSISTANT: Please give me some time to check it.

USER: Ok, take your own time.

ASSISTANT: Brown, thank you for your patience. I have to inform you that there is no reservation found on the user name to help you out in cancellation process.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: You are most welcome and thank you for approaching us.