You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how could I aid you today?

USER: Meeting a family friend on his birthday got postponed, can you help me in changing the existing reservation?

ASSISTANT: May I know your name please?

USER: My name is Margaret Gonzalez.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: There is no reservation found with your provided name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.