You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: As my plan to attend my client meeting got postpone due to bad weather conditions, can you help me to change an existing reservation?

ASSISTANT: Sure, can you help me with your name?

USER: I am Jeffery Williams.

ASSISTANT: Thank you for your details. Sorry, no reservation found on your name.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for reaching us.