You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Edward Parker.

ASSISTANT: How can I serve you today?

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

ASSISTANT: Ok, please wait while I check.

USER: Sure.

ASSISTANT: Sorry, there is no reservation done on your name.

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

ASSISTANT: Thank you for choosing our agency.