You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, I am willing to help you. May I know on which name the reservation was done?

USER: My name is Carolyn Taylor.

ASSISTANT: Ok, please stand by I will get back to you.

USER: Sure.

ASSISTANT: Thanks for your time, sorry to say no reservation found with your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.