You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: This is Linda Collins.

ASSISTANT: How can I help you?

USER: Could you please help me to modify my reservation?

ASSISTANT: Could you please give me a minute?

USER: OK.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: OK, thank you for your information.

ASSISTANT: Thank you for contacting.