You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Dennis Perez.

ASSISTANT: How can I help you?

USER: Owing to an emergency, I need to  cancel my recent reservation. Can you please help me in that?

ASSISTANT: Sure, let me check your reservation details in our database.

USER: Ok, take your time.

ASSISTANT: Sorry, I did not find any reservation by your name in our database.

USER: It's ok, not an issue. Thank you for your response.

ASSISTANT: Thank you for reaching us.