You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Barbara Martin, I need a change my journey dates with new one as I postponed my plan for a vacation. Can you change my reservation?

ASSISTANT: Sure, please wait for minutes, let me check and revert you.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation with your name.

USER: Ok, no problem.

ASSISTANT: Thank you, for reaching us.

USER: Thanks for helping me.