You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Helen Martinez.

ASSISTANT: How may I aid you today?

USER: I made a reservation earlier to attend a meeting in Houston but, due to some problems with clients meeting venue got changed to Seattle. So, can you please change my reservation?

ASSISTANT: Sure, I am here to help you out. Please allow me a moment.

USER: Sure.

ASSISTANT: Sorry  Helen Martinez, there is no reservation with your name in our database.

USER: Ok, thanks for information.

ASSISTANT: Thank you for reaching us.