You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Linda Martin here. Can you help me to change my reservation to next week?

ASSISTANT: Give me a moment to check the reservation status.

USER: Sure, please.

ASSISTANT: Sorry Martin, I have not find any reservation under your name.

USER: That is fine. Thank you for your time.

ASSISTANT: It's my duty, thank you for opting our service.