You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Jason Miller this side, owing to emergency I need to do some modifications in my existing reservation, can you please help me in do some modifications?

ASSISTANT: Sure, I will help you to change your reservation.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry Miller, we couldn't found any reservation on your name.

USER: No issues, thank you for giving me clarification, I will recheck with my mails.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.