You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How could I serve you?

USER: I would like to change my flight reservation as I met with an accident, can you please help me?

ASSISTANT: Sure, on which name your ticket has been reserved?

USER: Thank you. Please check in the name of Frank Walker.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Unfortunately there is no reservation found with your given name.

USER: Sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you.