You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Betty Hill here.

ASSISTANT: Betty, how may I render you?

USER: I want to travel from DCA to OAK for attending a seminar. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, please provide your travel dates.

USER: My travelling dates are from 02/04 to 02/06.

ASSISTANT: Please give me a moment to check for available flights.

USER: Ok, I will wait.

ASSISTANT: Do you have any specifications?

USER: Make sure my connections limit is 1.

ASSISTANT: Ok. Sorry, no airlines is providing a connecting flight on your planned dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for contacting us.