You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jacob Evans.

ASSISTANT: How may I assist you now?

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

ASSISTANT: Jacob Evans, please allow me to check with your booking.

USER: Sure.

ASSISTANT: Sorry to say, there is no active reservation by your name.

USER: Ok, no problem at all. Thank you for your information.

ASSISTANT: Thank you for choosing us.