You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Jack Walker, can you please help me to change my reservation which was booked to Houston?

ASSISTANT: Sure, we are here to help you. Please, stay online.

USER: Sure.

ASSISTANT: Thank you for your valuable time. No reservation was found on your name.

USER: Ok, thanks for informing me.

ASSISTANT: Thank you for reaching us, have a good day.