You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Can you change my reservation as my brother got the dates wrong?

ASSISTANT: It's my pleasure to help you. May I know your name to check with the status?

USER: Charles Martinez here.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting. Sorry, there is no active reservation found under your name to amend.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.