You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I render you at this moment?

USER: Due to an emergency, I want to change my reservation. Can you help me?

ASSISTANT: Sure, please provide your good name?

USER: Kenneth Thompson here.

ASSISTANT: Ok,  wait for couple of minutes.

USER: Sure.

ASSISTANT: There is no existing reservation found on your name.

USER: No problem, Thank you.

ASSISTANT: Thank you for availing us.