You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: I just need your assistance in making my reservation having no stops from my source to destination.

ASSISTANT: Sure, can I know your travelling codes for further process?

USER: Sure, my airport codes could be from PA- PHL to DC- IAD.

ASSISTANT: May I know your preferred travelling dates?

USER: I am planning to travel from 10/13 to 10/15.

ASSISTANT: Thank you for sharing your details, but I am sorry to inform that there is no flight found matching with your requirements. May I know your good name?

USER: My name is James Perez. That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.