You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am David Jackson. Due to emergency I need to cancel my recent reservation, Can you please help me with hat?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for opting us.