You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How could I aid you?

USER: Owing to an emergency, I want to change my reservation. Can you please help me with that?

ASSISTANT: Sure, may I know your name please?

USER: I am Robert Johnson.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no reservation found with your given name.

USER: That's ok, thank you for reaching us.

ASSISTANT: Thank you for opting us.