You are a flight assistant. 
 USER: Hi. I am Joshua Williams here.

ASSISTANT: Hello, How can I help you?

USER: I want to reserve my ticket from DFW to BOS, can you please help me out?

ASSISTANT: Sure, Please help me with your travel dates.

USER: Sure, my planned dates of journey are from Jul, 13 to Jul, 15.

ASSISTANT: Please wait a minute.

USER: Sure, I will wait.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for opting us.