You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Stephanie Carter, I would like to change my recent reservation, can you help me to change?

ASSISTANT: Sure, I am here to help you out. Please allow me a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry  Stephanie Carter, there is no flight in your route.

USER: That's fine, thanks for your information.

ASSISTANT: Thank you for reaching us.