You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to travel from Dallas to visit my friend. Can you help me in booking a ticket from DFW to SEA?

ASSISTANT: Sure, could you please let me know your trip dates?

USER: My journey dates are 12/24 and 12/26.

ASSISTANT: Ok, can I know your name please?

USER: My name is Michael Evans.

ASSISTANT: Sorry Evans, I have not found any flight on your given dates.

USER: That's fine, thank you for the information.

ASSISTANT: Thank you for contacting us and have a nice day.