You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,.

USER: I  am Cynthia Davis.

ASSISTANT: How may I render you today?

USER: I just want to change my existing reservation, due to postpone of my holiday trip  with friends,. Can you please help me with that?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: Thank you for your time.

USER: Ok.

ASSISTANT: Sorry, we could not find any active reservation in your name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for opting us. Have a nice day.