You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I would like to book a ticket from DCA to EWR, as there is a volleyball match to attend. Can you help me in booking?

ASSISTANT: Sure, we are here to help you.

USER: Ok.

ASSISTANT: Can you share me your travelling dates to book a flight ticket?

USER: My trip dates are Sep 19 to Sep 21.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: No issue, thank you.

ASSISTANT: Thanks for approaching us.