You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER:  I am Sandra Mitchell want to change my reservation due to heavy snow storm. Can you help me in changing?

ASSISTANT: Sure, give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation found under your name.

USER: Ok, no issues. Thank you for availing me.

ASSISTANT: Thank you for choosing us.