You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

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

ASSISTANT: Sure, when are you planning to travel?

USER: My travelling dates are on Nov 11 and Nov 13.

ASSISTANT: How many connections do you need?

USER: I need a direct flight.

ASSISTANT: Any other requirements to be met?

USER: No.

ASSISTANT: Please forward your name.

USER: My name is Mary Jackson.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: Ok, not a problem. Thank you for your response.

ASSISTANT: Thank you for opting us.