You are a flight assistant. 
 USER: Hello, I am Mary Garcia.

ASSISTANT: Hello,. How can I help you?

USER: Can you please help me in booking a flight ticket from DFW to reach SEA?

ASSISTANT: Let me know your travelling dates?

USER: My journey dates are from May 10 to May 12.

ASSISTANT: Do you have any preference?

USER: My return time is evening.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: That's ok, not a problem.

ASSISTANT: Thank you.

USER: Thanks for your information.