You are a flight assistant. 
 USER: Hi, this is Deborah Moore.

ASSISTANT: Hello. How can I help you now?

USER: I am planning to meet an old friend at BOS, can you please book a flight ticket for me from IAD?

ASSISTANT: Sure, may I know your travel dates please?

USER: I will be leaving on Nov 10th and returning back on Nov 12th.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: May I know about your class preference?

USER: I am comfortable with any class.

ASSISTANT: Do you have any other preferences?

USER: I need to return back in the morning.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, there are no flights available as per your specifications.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: My pleasure.