You are a flight assistant. 
 USER: Hello, Jason Thomas here.

ASSISTANT: Hello. What can I do for you?

USER: I am planning to visit Seattle to meet my friend, can you please book me a ticket from SFO to SEA?

ASSISTANT: Sure. when do you like to travel?

USER: My preferable journey dates are from 03/21 to 03/23.

ASSISTANT: I am sorry no flights found on your requirement.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: Ok. thank you for choosing us.