You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: Owing for an emergency, I want to cancel my flight reservation. Can you please help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you please mention your name?

USER: Sure, my name is Ryan Walker.

ASSISTANT: Sorry, no reservation found with your name.

USER: That's fine, thank you for checking.

ASSISTANT: Thank you for choosing us.