You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Book a flight ticket to Seattle, SEA from Chicago, ORD.

ASSISTANT: Sure, please share me your travelling dates?

USER: My travelling dates are 05/27 and 05/29.

ASSISTANT: Please wait a minute.

USER: OK.

ASSISTANT: Sorry there are no flights with your specifications.

USER: Ok, no problem. My name is Donna Harris.

ASSISTANT: Thank you for reaching us.

USER: Thanks for the information.