You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Katherine Collins.

ASSISTANT: How may I guide you today?

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

ASSISTANT: Sure, I will help you with that. Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

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

ASSISTANT: Thank you for your contacting us.

USER: Welcome.