You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me to change the reservation which I had done last week?

ASSISTANT: Sure, may I know your name?

USER: Ok, please check for the name Larry Thompson.

ASSISTANT: Sure, wait a minute.

USER: Ok, please take the time you need.

ASSISTANT: Sorry, there was no reservation found on your name.

USER: That is ok, thank you for assisting me.

ASSISTANT: Thank you for reaching us.