You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Stephen Parker here.

ASSISTANT: How can I help you?

USER: Due to sudden work, I need to change my reservation. Can you please help me with it?

ASSISTANT: Sure, I am here to help you. Please stand by.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry to inform no reservation found on your name.

USER: Not an issue, thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.