You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Margaret Lee.

ASSISTANT: What can I do for you Lee?

USER: I want to attend my friend's wedding in Washington.Can you help me in booking a ticket?

ASSISTANT: Lee, can you please provide us your airport codes?

USER: I want to travel from IAD to DCA.

ASSISTANT: On which dates you are willing to travel?

USER: I would like to fly on 09/18 and 09/20.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: There is a direct flight available in Southwest airlines. Is it ok for you?

USER: No, I would like to have 1 connection. Check for that.

ASSISTANT: I have rechecked it, but there are no flights available with 1 connection on your preferred dates.

USER: That's ok.

ASSISTANT: What else can I do for you?

USER: Anyways, thank you for your help.

ASSISTANT: Thank you for contacting us.