You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: Due to some emergency I need to change my existing reservation, Can you help me changing my reservation?

ASSISTANT: Ok, please tell me your name and month of booking to check with your existing reservation?

USER: I am Frank Anderson.

ASSISTANT: Ok, please hold on for a moment till I check with flight reservation by your name.

USER: Sure.

ASSISTANT: Sorry, there is no flight reservation available by your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for consulting with our services.