You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please assist me to change my existing reservation due to bad weather at my end?

ASSISTANT: On whose name previously booked?

USER: It is on my name, Sarah Roberts.

ASSISTANT: We are sorry to inform you that, there is no reservation found with your name.

USER: It is fine, may be I have done it with my other travel agent. Thank you for your time though.

ASSISTANT: Thank you for reaching us with a query.