You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I oblige you today?

USER: I am Charles Wilson. Please, change my earlier reservation.

ASSISTANT: Sure, we are here to aid you.

USER: Thank you.

ASSISTANT: Please, wait.

USER: Ok.

ASSISTANT: Thanks for your time, there is no reservation.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.