You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Justin Thomas here, I want to reserve my ticket from SFO to BOS, can you please help me?

ASSISTANT: May I know your desired travel dates please?

USER: Sure, my desired dates of journey is from 05/24 to 05/26.

ASSISTANT: Please wait a while.

USER: Sure, I will wait.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, no problem.

ASSISTANT: Thank you for opting us. Have a nice day.