You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Andrew Miller.

ASSISTANT: How can I help you today?

USER: Would it be possible to change my reservation to new travelling dates?

ASSISTANT: Sure, wait a second I will check the update.

USER: Sure, take your time.

ASSISTANT: There is no reservation found under your name to change.

USER: It's ok, thanks for checking my current status of my reservation.

ASSISTANT: Thank you for choosing us.