You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Emma smith here.

ASSISTANT: How may I help you today?

USER: I want to change my existing reservation due to heavy snow fall, can you please check with this one?

ASSISTANT: Sure, I am here to help you with that. Please wait for a minute.

USER: Ok, take your own time.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our database.

USER: No problem, thank you for your service.

ASSISTANT: Thank you for approaching us.