You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I need to change my reservation due to urgent meeting, can you help me?

ASSISTANT: May I know your name please?

USER: I am Laura Jones.

ASSISTANT: Please allow me to check with availability.

USER: Ok.

ASSISTANT: I am very sorry to inform you, there are no flights available for your journey.

USER: That's ok. Thank you for your help.

ASSISTANT: Most welcome.