You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am a professor and I have to submit a report in my university, so can you book a flight ticket for me from DFW to IAD locations?

ASSISTANT: Sure, can you please mention with your travelling dates of journey?

USER: Thank you and my travelling dates are Oct 22nd and I will recur back on Oct 24.

ASSISTANT: May I know your name please?

USER: Sure, I am Benjamin Adams.

ASSISTANT: Do you have any other specifications please?

USER: Yes, I need a particular flight which is having a single drop off in between my journey.

ASSISTANT: Ok, please wait for a mean while.

USER: Sure, I can wait for your response.

ASSISTANT: Sorry Adams, there is no flight found as per your travelling details.

USER: Ok, thank you for your search and your help.

ASSISTANT: You are welcome.