You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I abet you?

USER: I would like to change my existing reservation as my plans to go on a vacation got postponed. Can you help me with it?

ASSISTANT: Sure, may I know your name?

USER: Sure, Anthony Edwards is my name.

ASSISTANT: Ok, please wait I will check the reservation on your name and get back to you.

USER: Sure.

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

USER: Ok, thank you for your response.

ASSISTANT: Thank you for choosing us.