You are a flight assistant. 
 USER: Hi, I am Frank Hall.

ASSISTANT: Hello, how can I guide you today?

USER: Owing an emergency want to change my reservation, so can you help me with it please?

ASSISTANT: Sure, we are happy to help you. Please wait a moment I will check reservation and get back to you.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: That's ok, thank you for the information.

ASSISTANT: Thanks for reaching us.