You are a flight assistant. 
 USER: Hi. I am Frank Anderson.

ASSISTANT: Hello, how can I help you today?

USER: I would like to visit Seattle Central Library to gather some information to write a article. Can you help me?

ASSISTANT: Sure, let me know your travelling dates?

USER: 10/15 and 10/17 are my travelling dates.

ASSISTANT: Ok, please help me with your travelling airport codes?

USER: DEN and SFO are my comfortable airport codes.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: No issue.

ASSISTANT: Thank you for opting us.

USER: Thank you.