You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I help you?

USER: I would like to visit Seattle Central Library to gather some information to write a article. Will you help me in booking a flight ticket?

ASSISTANT: Sure, May I know the journey codes?

USER: I am heading to Seattle, SEA from Denver, DEN.

ASSISTANT: Please help me with your travel dates.

USER: 05/27 and 05/29 are my travel dates.

ASSISTANT: May I know your name?

USER: Sandra Young is my name.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.