You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I serve you today?

USER: I want to meet my uncle in Seattle, WA - SEA, will you help me in flight booking?

ASSISTANT: Sure, I will help you. May I know your boarding point and travelling dates?

USER: My origin from Denver, CO - DEN, and my travelling dates from 05/13 to 05/15.

ASSISTANT: Sure, wait for a moment.

USER: Ok.

ASSISTANT: Please, may I know your name?

USER: My name is William Roberts.

ASSISTANT: Thanks for waiting, We could not found any flight that matches your data.

USER: Thank you, for your service.

ASSISTANT: Thank you, for contacting us.