You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my reservation due to some family problem.

ASSISTANT: Sorry to hear that. Please provide me your name.

USER: Myself Dorothy Wilson.

ASSISTANT: Please wait a minute. Wilson, there is no reservation found with your details.

USER: That's fine. Thank you.

ASSISTANT: Thank you for reaching us.