You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: Due to sudden work, I want to alter my reservation. Can you please help me with it?

ASSISTANT: Sure, may I know your name?

USER: Brandon Hernandez here.

ASSISTANT: Please wait, I will check the reservation in the database and get back to you.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name to alter.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for contacting us.