You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Jason Edwards. Owing to an emergency, I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Ok.

ASSISTANT: Jason Edwards, there is no reservation found under your name.

USER: Not an issue. Thank you.

ASSISTANT: You are welcome. Thank you for contacting us.