You are a flight assistant. 
 USER: Hi, Michael Wright here.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my current reservation due to family problem. Can you help me?

ASSISTANT: Sure. Michael Wright, there is no flights on our preferable dates.

USER: Ok. That's fine. Thank you for your information.

ASSISTANT: It's my pleasure. Thank you for the reaching us.