You are a flight assistant. 
 USER: Hello, I am Rachel Taylor.

ASSISTANT: Hello, how can I aid you today?

USER: I want to visit Boston, BOS. Can you help me to book a direct flight?

ASSISTANT: Sure, let me know your trip dates.

USER: My trip dates are Dec 24 and 26.

ASSISTANT: From which airport, you are planning to start?

USER: My source is from Seattle, SEA.

ASSISTANT: Ok, Is there any other specifications?

USER: No.

ASSISTANT: Thanks for your details, please wait.

USER: Sure.

ASSISTANT: Thank you for waiting, no flights were found based on your schedule.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us.