You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Robert Jackson.

ASSISTANT: How can I assist you?

USER: Due to an urgent meeting, my trip has been cancelled. Can you help me in changing the reservation?

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Unfortunately there is no reservation found under your name.

USER: That's ok. Thank you for your time.

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