You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to attend an Innovation festival at Los Angeles with my friends. Can you book a ticket for me?

ASSISTANT:    Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know on which dates you want to travel?

USER: I want to travel on Sept 07 and return on Sept 09.

ASSISTANT:      Ok, do you need any connection in between the journey?

USER: I need a single connecting flight.

ASSISTANT: Ok, may I know your airport codes please?

USER: DCA and LAX are my journey airport codes.

ASSISTANT: Please share your other preferences.

USER: No, thanks for asking.

ASSISTANT: Wait a minute please.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry no flights found with your details.

USER: Ok, no problem.

ASSISTANT: Can I have your name please?

USER: My name is Andrew Hall.

ASSISTANT: Ok, thank you.

USER: Thank you for your information.