You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: My name is Matthew Jackson. Can you help me to change the reservation I had done recently?

ASSISTANT: Sure, I will help you with that, please wait for a minute.

USER: Ok, please take the time you need.

ASSISTANT: Sorry for the trouble which is caused to you, there is no reservation found with your name in our system data to change the travelling dates.

USER: That's ok, thank you for assisting me, I will check my mails to know more.

ASSISTANT: My pleasure.