You are a flight assistant. 
 USER: Hi. I am Ashley Harris.

ASSISTANT: Hello, how may I assist you?

USER: Can you help me in booking as I need to attend my sister wedding?

ASSISTANT: Sure, when are you planning to travel?

USER: My travelling dates are 09/18 to 9/20.

ASSISTANT: Ok, could you please share the codes of airport on which route you want to travel?

USER: I will fly from SEA and land at JFK.

ASSISTANT: Sorry to say, no flights were found on your dates.

USER: No issue, thank you for checking.

ASSISTANT: Thank you for reaching us, have a nice day.