You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How could I assist you today?

USER: I want to change my recent reservation. Can you help me out?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can I know your good name please?

USER: I am Thomas White.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

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

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for choosing us.