You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Patricia Martin here, I want to reserve my ticket within the dates from 07/19 to 07/21, can you please help me in this intent?

ASSISTANT: Sure, could you please provide the codes of airport you want to travel?

USER: Ok, my respective airports codes are from BOS to DTW.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure, take your time.

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

USER: Ok, no problem. I will try with the another travelling agency.

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