You are a flight assistant. 
 USER: Hello. My name is Melissa Scott. Due to an emergency, I want to postpone my trip.

ASSISTANT: Hello Melissa, how can I help you?

USER: Could you help me in changing the reservation?

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Sorry Scott, I didn't find any reservation with your name.

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

ASSISTANT: You are welcome.