You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can help you at this moment?

USER: I want to change my existing reservation due to postpone of cricket match. Can you help me in that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can you please mention your name for further process?

USER: Samuel Edwards here.

ASSISTANT: There is no previous reservation available under your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.