You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I render you?

USER: Please book a ticket from Chicago, IL-ORD to Seattle, WA-SEA.

ASSISTANT: Sure, may I know your travelling dates?

USER: Departure is by 08/24 and 08/26 is return date.

ASSISTANT: Please give me a minute.

USER: Sure.

ASSISTANT: Let me know your good name.

USER: I am Emily Parker.

ASSISTANT: There is no flight found matching with your requirements.

USER: Thank you.

ASSISTANT: Thanks for reaching us.