You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: I am Eric Johnson, please book a direct flight from Seattle,SEA.

ASSISTANT: Sure, May I know the source code?

USER: I have just mentioned.

ASSISTANT: Please help me with your travel dates.

USER: Sure, I need to travel on 04/25 to attend the sports meeting. I will return on 04/27.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: Thank you for sharing the informaion.

ASSISTANT: Thank you for opting us.