You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I would like to make a flight ticket reservation from LAX to IAD, can you please help me?

ASSISTANT: Sure, can I know the travel dates please?

USER: Sure, my planned travelling dates are May, 07 and 09 respectively.

ASSISTANT: May I know your name please?

USER: Sure, my name is Lisa Lee here.

ASSISTANT: Do you have any requirements?

USER: Yes, flight has to be with single connection with economy class.

ASSISTANT: Sorry, there are no flights available as per your request.

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

ASSISTANT: Thank you for approaching us.