You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I am Dennis Collins.

ASSISTANT: How may I aid you today?

USER: Owing to emergency I want to cancel my recent reservation.

ASSISTANT: Sure, please stand by.

USER: Sure.

ASSISTANT: There is no recent reservation found on your name.

USER: Ok,thank you.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.