You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, please share your name to check your reservation.

USER: I am Charles Williams.

ASSISTANT: Please wait for a while.

USER: Ok, take your time.

ASSISTANT: We didn't find any reservation on your name to change.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for reaching us.