You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,.

USER: I am Justin Evans.

ASSISTANT: How can I help you today?

USER: Due to earthquakes disaster happened in the place where I wanted to visit,I want to change my existing reservation. Would you please help me with reservation?

ASSISTANT: Sure. Please hold on a moment, I will get back to you.

USER: Sure.

ASSISTANT: Thanks for holding on. No reservation found with your given name.

USER: No worries at all. Thank you for your kind information.

ASSISTANT: Thank you for availing us. Have a good day.