You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, which service are you seeking for today?

USER: Can you help me change my existing reservation due to bad weather at my place, which was made on the name of Janet Parker?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: I regret, there is no reservation exist on your name to proceed further.

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.