You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I want to book a flight ticket from SFO to IAD, can you help me with that?

ASSISTANT: Sure, can you please forward your journey dates?

USER: My trip dates are 12/12 and 12/14.

ASSISTANT: In which class do you prefer to travel?

USER: I am ok with any class.

ASSISTANT: Can you please mention your connection limit please?

USER: I need a single connection flight.

ASSISTANT: Please let me know your other preferences.

USER: Nothing.

ASSISTANT: Ok, please wait for a while. Sorry there are no flights are available matching your details.

USER: That's ok. Thank you for your help.

ASSISTANT: For documentation purpose may I know your name please?

USER: I am Brandon Martinez.

ASSISTANT: Thank you  for choosing us.

USER: Thank you.