You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: Can you please help me in booking a flight ticket from IAD to OAK?

ASSISTANT: Sure, may I know your journey dates?

USER: I want to fly on Feb 20 and return on Feb 22.

ASSISTANT: Do you need any break in your journey?

USER: I need a single connection.

ASSISTANT: May I know your depart and arrival time?

USER: I am comfortable with any timings.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Can you share me your good name please?

USER: Myself Joshua Allen.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: Not an issue.

ASSISTANT: Thank you for opting us.

USER: Thank you.