You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: I need to amend an existing reservation due to an emergency, can you please help me?

ASSISTANT: Sure, I am here to help you. May I know on whose name the ticket has been reserved formerly?

USER: Sure, my name is Jacob Turner here.

ASSISTANT: Sorry Jacob Turner, there are no flights reserved on your given dates.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.