You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I have to change the trip dates because my friend is unable to travel now with us, so we have postponed the trip. Can you please help me to modify the details?

ASSISTANT: Please mention your name for checking the reservation status.

USER: Ok, my name is Susan Miller.

ASSISTANT: Please give me a moment.

USER: Sure. I can wait.

ASSISTANT: There is no reservation found under your name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Welcome, have a great day.