You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you the best today?

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

ASSISTANT: Sure, I am here to help you. On which name your previous ticket has been reserved?

USER: Jacob White.

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 your help.

ASSISTANT: Thank you.