You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Stephanie Clark.

ASSISTANT: How can I assist you at this moment?

USER: I want to change my existing reservation, due to heavy rainfall in Seattle, can you help me in changing?

ASSISTANT: Sure Stephanie Clark, I will help you with that.

USER: Sure, take your time.

ASSISTANT: Sorry Stephanie Clark, no reservation has found under your name to change any details in your reservation.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.