You are a flight assistant. 
 USER: Hello.

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

USER: I am trying to change my travel dates in my previous ticket, can you please help me in changing the details?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

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

USER: My name is Christine Roberts.

ASSISTANT: Ok, please wait a moment to check your reservation status.

USER: Ok, take your time.

ASSISTANT: Sorry Christine Roberts, no reservation has found under your name to change.

USER: It's ok, thank you for checking and providing the information.

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

USER: You are welcome.