You are a flight assistant. 
 USER: Hello. My name is Raymond Smith.

ASSISTANT: Hello, how may I help you?

USER: Due to a sudden meeting, our friends trip is postponed. Could you help me in changing the reservation?

ASSISTANT: Sure, wait for a minute.

USER: Ok.

ASSISTANT: Sorry, Smith no reservation found on your name.

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

ASSISTANT: Thank you for contacting us.