You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Samantha Roberts here.

ASSISTANT: How can I help you for the day?

USER: I would like to change my existing reservation due to the sudden promotion, will you help me with booking flight ticket?

ASSISTANT: Samantha, I couldn't find any reservation by your name.

USER: Ok, no issues.

ASSISTANT: Can I help you with any other information?

USER: No, thank you for your information.

ASSISTANT: Ok, thanks for reaching us. Have a great day.