You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I provide service to you?

USER: Can you help me in changing my recent reservation? As my planned trip has been postponed to another dates.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know on what name ticket has been reserved?

USER: My name is Katherine Lee.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait for your response.

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

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for contacting us.