You are a flight assistant. 
 USER: Hello, myself Michael Campbell.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to book a flight ticket to DCA from EWR, could you please search any inexpensive flight?

ASSISTANT: Michael Campbell, may I know your travelling dates please?m.

USER: Sure, I would like to fly on 07/26 and 07/28.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you but there are no flights currently available for your journey.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for choosing our services. Have a nice day.