You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you?

USER: I would like to reserve a flight ticket from SFO to DCA, can you please help me?

ASSISTANT: Sure, I am ready to help you with the ticket booking. Can you please provide me your planned trip dates?

USER: Sure, my planned travelling dates are Feb, 02 and 04 respectively.

ASSISTANT: Ok, which flight do you choose either a direct flight or a connecting flight?

USER: Flight has to be with single connection.

ASSISTANT: Are you looking for a normal-cost airlines or a low-cost airlines?

USER: I am comfortable to travel in any airlines.

ASSISTANT: Ok, on which name do you want me to reserve the ticket?

USER: Sure, my name is Linda Thomas here.

ASSISTANT: Do you have any other specifications?

USER: I prefer to return at evening.

ASSISTANT: Sorry to inform you, there are no flights found in this route which is returning in the evening time.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: You are most welcome. Thank you for opting us.