You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you please aid me to change the ticket details? Because I have postponed my trip due to some important meeting.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you please mention your name?

USER: My name is Sarah Allen.

ASSISTANT: Sorry, no reservation found with your given name.

USER: Oh! So sad to hear from your end. Anyways  thank you for your time.

ASSISTANT: Thank you for opting us.

USER: Most welcome.