You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Joshua Lewis. I am planning to change my reservation to another destination, so can you help me to change my reservation?

ASSISTANT: Sure, please wait a moment.

USER:      Ok.

ASSISTANT: Sorry to say, no reservation found with your name.

USER:  That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us.