You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am trying to modify my travelling dates in my previous ticket. Can you please help me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can I have your name please for checking your reservation status?

USER: My name is Matthew Jackson.

ASSISTANT: Ok, please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry  Matthew Jackson, no reservation found under your name.

USER: It's ok, thank you for checking for my previous ticket.

ASSISTANT: Thank you for choosing us, have a good day.