You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I need to change my existing reservation, because my business trip is postponed. So will you alter my reservation?

ASSISTANT: Sure, I will help you with this.

USER: Thank you.

ASSISTANT: Can you please provide your name to check the reservation status in our database?

USER: I have booked my ticket with name Brenda Martinez.  So go ahead and check with this name.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Brenda Martinez, there is no reservation found with your name in our database.

USER: It's ok, thank you.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.